Cost Accounting Quiz: Cost Behavior Classification
20 questions · exam conditions
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Cost Behavior ClassificationQuestion 1 of 20

A company is considering a temporary, one-month shutdown of its factory due to a sharp decline in customer orders. Which of the following costs is most likely to be classified as a fixed cost in its monthly operating budget but could potentially be avoided during the shutdown period?

Annual insurance premium on the factory building, paid in a lump sum in January.
Monthly straight-line depreciation charge for the factory's production equipment.
Property taxes on the factory, assessed annually but paid in monthly installments.
Monthly fee for a preventative maintenance service contract on production equipment.
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Cost Accounting Quiz

Cost Accounting Quiz: Cost Behavior Classification

Practice Cost Behavior Classification in Cost Accounting with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Cost Behavior Classification, giving you a quick way to practice the rules, question types, and explanations that matter most for Cost Accounting.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

A company is considering a temporary, one-month shutdown of its factory due to a sharp decline in customer orders. Which of the following costs is most likely to be classified as a fixed cost in its monthly operating budget but could potentially be avoided during the shutdown period?

  1. Annual insurance premium on the factory building, paid in a lump sum in January.
  2. Monthly straight-line depreciation charge for the factory's production equipment.
  3. Property taxes on the factory, assessed annually but paid in monthly installments.
  4. Monthly fee for a preventative maintenance service contract on production equipment. (correct answer)
Explanation: This question asks to identify a discretionary fixed cost. Annual insurance (A) and property taxes (D) are committed costs for the period, regardless of shutdown. Depreciation (B) is a sunk cost allocation and will continue to be recorded. The preventative maintenance contract (C) is a fixed monthly fee, but it is a discretionary cost. Management could likely negotiate to suspend or cancel the service for the month the factory is not operating, thus avoiding the cost. This distinguishes it from the other committed fixed costs.

Question 2

A company uses a specific chemical in its production process. The chemical must be purchased in 10-liter containers at a cost of $200 per container. Each unit of finished product requires 0.5 liters of the chemical. The company cannot store partial containers. Production can range from 1 to 100 finished units per day. How is the cost of this chemical best classified?

  1. A variable cost, as it can be approximated by a linear function related to production.
  2. A step-variable cost, as the cost is incurred in small, discrete steps as production increases. (correct answer)
  3. A mixed cost, as the need to buy a full container represents a fixed component.
  4. A fixed cost, as a container must be purchased before any production can occur.
Explanation: The cost of the chemical increases with production, but not smoothly. A new $200 container is purchased after every 20 units are produced (10 liters / 0.5 liters per unit). Because the cost increases in small, frequent, discrete steps that are closely related to volume, it is best classified as a step-variable cost. While it can be approximated by a variable cost, 'step-variable' is the more precise and superior classification.

Question 3

In a manufacturing setting experiencing a significant learning curve effect, newly hired employees become progressively faster at their tasks. In the initial months of production for a new product, how would the total direct labor cost likely behave in relation to the number of units produced?

  1. As a variable cost with a decreasing per-unit rate. (correct answer)
  2. As a fixed cost, because total labor hours are difficult to predict.
  3. As a mixed cost, with a fixed component representing the initial training period.
  4. As a step-fixed cost, decreasing as efficiency milestones are reached.
Explanation: Total direct labor cost is a variable cost because it changes in total with the number of units produced. The learning curve effect means that the labor time per unit decreases as cumulative production increases. This results in a variable cost where the per-unit rate is not constant but decreases as volume grows. It is still classified as variable because the total cost varies with output, even if the relationship is not perfectly linear.

Question 4

A company's sales representatives earn a monthly salary of $3,000 plus a commission of 5% on all sales revenue. Additionally, any representative who generates over $100,000 in sales revenue in a month receives a one-time $2,000 bonus for that month. Which of the following best describes the cost behavior of the total monthly compensation for a single sales representative?

  1. A mixed cost with a step-fixed component. (correct answer)
  2. A pure variable cost because it is entirely driven by sales volume.
  3. A step-variable cost that increases with each dollar of sales.
  4. A fixed cost because of the stable monthly salary component.
Explanation: The total compensation cost has three parts: a fixed salary (3,000),avariablecommission(53,000), a variable commission (5% of sales), and a bonus that is paid only when a certain activity level is reached (100,000 in sales). The combination of the fixed salary and variable commission makes it a mixed cost. The $2,000 bonus creates a sudden jump in cost at a specific point, which is a step-fixed component. Therefore, the overall cost is a mixed cost with a step-fixed component.

Question 5

A manufacturing company's maintenance costs are a mixed cost. At a production level of 10,000 units, the total maintenance cost is $45,000. At a production level of 18,000 units, the total maintenance cost is $61,000. The company is now planning a production level of 14,000 units. What is the expected total fixed portion of the maintenance cost at this new production level?

  1. $20,000
  2. $28,000
  3. $25,000 (correct answer)
  4. $53,000
Explanation: This is a two-step problem. First, calculate the variable cost per unit. Second, use the variable rate to calculate the total fixed cost.
  1. Variable rate = (Change in Cost) / (Change in Activity) = ($61,000 - $45,000) / (18,000 - 10,000 units) = $16,000 / 8,000 units = $2.00 per unit.
  2. Total Fixed Cost = Total Cost - (Variable Rate × Activity) = 45,000−(45,000 - (2.00 × 10,000 units) = $45,000 - $20,000 = $25,000. The fixed cost remains constant regardless of the production level within the relevant range.

Question 6

A company requires one supervisor for every 15 assembly line workers. Each supervisor is paid a salary of $80,000 per year. Each assembly worker can produce 1,000 units per year. The company's production can range from 5,000 to 50,000 units annually. How should the total annual cost for supervisors' salaries be classified?

  1. A step-fixed cost because the cost increases in wide, discrete increments as the number of required supervisors changes. (correct answer)
  2. A variable cost because the total salary expense is directly proportional to the number of workers required for production.
  3. A mixed cost because there is a base salary component and a component that changes with production volume.
  4. A step-variable cost because the cost increases in small increments as production requires additional supervisory staff.
Explanation: The cost of supervisors' salaries is a step-fixed cost. One supervisor is needed for up to 15 workers (or 15,000 units of production). If production increases to 16,000 units, a second supervisor is needed, and the total cost abruptly jumps by $80,000. These increases occur in large, discrete steps tied to a significant range of activity (15,000 units). This wide step is characteristic of a step-fixed cost, not a step-variable cost, which has much narrower steps.

Question 7

A company leases a production facility for $100,000 per month. The lease agreement specifies that this facility has a maximum capacity of 50,000 units per month. If the company needs to produce more than 50,000 units in a month, it must lease a second, identical facility for an additional $100,000 per month. The company's normal operating level, which it considers its relevant range, is between 30,000 and 45,000 units per month.

Based on the passage, which statement best describes the lease cost?

  1. The lease cost is a variable cost because the total cost can change if production levels are high enough.
  2. The lease cost is a fixed cost because within the company's defined relevant range, the cost does not change with production. (correct answer)
  3. The lease cost is a mixed cost because it has a fixed component and a variable component tied to facility usage.
  4. The lease cost is a step-variable cost because it increases in response to small changes in production volume.
Explanation: Cost behavior is defined within a relevant range of activity. The company's relevant range is stated as 30,000 to 45,000 units. Within this range, the lease cost is constant at $100,000, making it a fixed cost. Although the cost could change if production goes beyond 50,000 units, that is outside the relevant range used for normal planning and decision-making.

Question 8

A telecommunications company offers a corporate mobile data plan with the following terms: a base fee of $2,000 per month, which includes 1,000 gigabytes (GB) of data. For usage between 1,001 GB and 2,000 GB, the rate is $1.50 per GB. For any usage exceeding 2,000 GB, the rate drops to $1.00 per GB. How should the total cost of this data plan be classified?

  1. A fixed cost, as there is always a minimum charge of $2,000 regardless of the data consumed.
  2. A variable cost, as the total payment changes in direct proportion to the total gigabytes used.
  3. A mixed cost, because it contains a fixed base fee and a variable component that changes with data usage. (correct answer)
  4. A step-fixed cost, because the cost structure changes abruptly at predefined thresholds of data usage.
Explanation: The cost has a fixed component (the $2,000 base fee) and a variable component (the charge per GB used above the included amount). This is the definition of a mixed cost. The fact that the variable rate changes at different levels of activity does not change its fundamental classification as a mixed cost, although it does make the variable component non-linear.

Question 9

Last month, a company incurred a total electricity cost of $15,000 when it operated for 4,000 machine hours. The company knows its electricity cost is mixed, and the fixed portion of the cost is $3,000 per month. During the current month, the company plans to operate for 4,500 machine hours. What is the expected total electricity cost for the current month?

  1. $16,500 (correct answer)
  2. $15,750
  3. $17,250
  4. $18,000
Explanation: This is a two-step calculation. First, determine the variable cost per unit (machine hour). Second, use that rate to project the total cost for the new activity level.
  1. Calculate the total variable cost for last month: Total Cost - Fixed Cost = $15,000 - $3,000 = $12,000.
  2. Calculate the variable cost per machine hour: $12,000 / 4,000 hours = $3.00 per machine hour.
  3. Calculate the expected total cost for the current month: Total Fixed Cost + (Variable Rate × Activity) = 3,000+(3,000 + (3.00 × 4,500 hours) = $3,000 + $13,500 = $16,500.

Question 10

A company is automating its production process by replacing assembly line workers with robotic equipment. The workers were paid on a piece-rate basis. The new robotic equipment will be acquired through a long-term operating lease. What is the most likely effect of this change on the company's cost structure?

  1. An increase in per-unit variable costs and a decrease in total fixed costs.
  2. A decrease in per-unit variable costs and an increase in total fixed costs. (correct answer)
  3. An increase in both per-unit variable costs and total fixed costs.
  4. A decrease in both per-unit variable costs and total fixed costs.
Explanation: The piece-rate labor is a variable cost. Replacing workers with robots eliminates this variable cost. The operating lease for the new equipment represents a significant fixed cost. Therefore, the change will cause total fixed costs to increase and per-unit variable costs to decrease. This increases the company's operating leverage.

Question 11

A software company pays for cloud computing services. The contract states a flat monthly fee of $5,000 for up to 10,000 hours of processing time. If usage exceeds 10,000 hours, an additional charge of $0.40 per hour is incurred. However, the total monthly charge will not exceed $7,000. Which of the following classifications best describes the cost behavior for usage between 10,001 and 15,000 hours?

  1. Variable, because the cost increases with each hour of processing time.
  2. Fixed, because the total monthly charge is capped at $7,000.
  3. Mixed, because the total cost is comprised of both fixed and variable elements in this range. (correct answer)
  4. Step-fixed, because the cost structure has multiple discrete tiers.
Explanation: The question specifically asks about the range between 10,001 and 15,000 hours. The cap of 7,000isreachedat15,000hours(7,000 is reached at 15,000 hours (5,000 fixed + (5,000 hours * $0.40/hr) = $7,000). So, within the specified range, the cost is calculated as $5,000 + 0.40perhour.Sincethecosthasbothafixedcomponent(0.40 per hour. Since the cost has both a fixed component (5,000) and a variable component ($0.40 per hour), it behaves as a mixed cost in this range.

Question 12

An analyst observes that as a company's production volume increases, the manufacturing cost per unit decreases. The total manufacturing cost, however, increases as production volume increases. Which of the following cost behaviors is most consistent with these two observations?

  1. A pure variable cost.
  2. A pure fixed cost.
  3. A mixed cost. (correct answer)
  4. A step-variable cost.
Explanation: If the cost were a pure variable cost, the cost per unit would be constant. If the cost were a pure fixed cost, the total cost would remain constant, not increase. The observations fit a mixed cost. The total cost increases because of the variable component. The cost per unit decreases because the fixed cost component is spread over more units. For example, if cost is Y = $1000 + $2X, at 100 units, total cost is $1200 and unit cost is $12. At 200 units, total cost is $1400 and unit cost is $7.

Question 13

A company incurs two significant fixed costs: (1) straight-line depreciation on its factory building, amounting to $500,000 per year, and (2) an annual research and development budget of $1,200,000, which is set by the board of directors each year. From a cost behavior perspective relative to production volume, how should these two costs be classified?

  1. Depreciation is a committed fixed cost, while R&D is a discretionary fixed cost; therefore, their fundamental cost behaviors differ.
  2. Both costs are classified as fixed because neither total cost changes in the short run with changes in production volume. (correct answer)
  3. Depreciation is a fixed cost, but the R&D budget should be classified as a mixed cost because its amount can be changed annually.
  4. Both costs are classified as variable because they are necessary for production to occur over the long term.
Explanation: The question asks for classification based on cost behavior relative to production volume. Both straight-line depreciation and the annual R&D budget do not change in total as the number of units produced changes within a relevant range. Therefore, both are classified as fixed costs. The distinction between committed (depreciation) and discretionary (R&D) fixed costs relates to management's ability to alter the spending in the short term, but it does not change their fundamental behavior classification relative to the activity driver (production volume).

Question 14

A company's electricity cost is defined by the formula Y = $1,500 + $5.00X, where X is machine hours. This formula is considered valid for a relevant range of 400 to 800 machine hours per month. Due to a new energy surcharge, if the company operates more than 800 machine hours, the fixed portion of the bill increases by $400, and the variable rate increases to $5.50 per hour. What would be the total electricity cost for a month where 900 machine hours are used?

  1. $6,000
  2. $6,450
  3. $6,850 (correct answer)
  4. $6,950
Explanation: The activity level of 900 machine hours is outside the original relevant range of 400-800 hours. Therefore, the new cost structure must be used. The new fixed cost is $1,500 + $400 = $1,900. The new variable rate is $5.50 per hour. The total cost is calculated as: Total Cost = New Fixed Cost + (New Variable Rate × Activity) = 1,900+(1,900 + (5.50 × 900) = $1,900 + $4,950 = $6,850.

Question 15

An analyst is examining a company's shipping expenses. The data for the last four quarters are as follows:

  • Q1: 10,000 units shipped, cost of $35,000
  • Q2: 12,000 units shipped, cost of $40,000
  • Q3: 15,000 units shipped, cost of $46,000
  • Q4: 12,000 units shipped, cost of $42,000

What is the most reasonable conclusion about the behavior of the shipping cost?

  1. The cost is variable, as it increases when more units are shipped.
  2. The cost is fixed, as the changes are not proportional to the volume changes.
  3. The cost is mixed, with a fixed component and a variable component per unit.
  4. The cost behavior is inconsistent and cannot be reliably classified without further investigation. (correct answer)
Explanation: In Q2 and Q4, the activity level was identical (12,000 units shipped), but the total costs were different ($40,000 vs. $42,000). A consistent cost function, whether variable, fixed, or mixed, should produce the same total cost for the same level of activity. This inconsistency suggests that the cost behavior is not stable or that other factors besides units shipped are influencing the cost. Therefore, it cannot be reliably classified with the given data.

Question 16

A company's management is considering a change to its sales compensation plan. The current plan pays a commission of 10% of revenue (a variable cost). The proposed plan would replace this with a 2% commission on revenue plus a significant increase in fixed monthly salaries for all salespeople. If the proposal is adopted, what would be the expected impact on the company's cost structure?

  1. The company's break-even point in sales dollars would decrease.
  2. Total fixed costs would decrease and the contribution margin ratio would increase.
  3. The company's operating leverage would decrease.
  4. Total fixed costs would increase and the contribution margin ratio would increase. (correct answer)
Explanation: The proposal involves increasing fixed monthly salaries, which increases total fixed costs. The variable cost (commission) is decreasing from 10% to 2% of revenue. A lower variable cost as a percentage of sales means that more of each sales dollar contributes to covering fixed costs. This results in a higher contribution margin ratio. An increase in fixed costs and an increase in the contribution margin ratio is the correct impact. This change would also increase operating leverage and likely increase the break-even point.

Question 17

A production department's monthly costs consist of two items: raw materials, which cost $20 per finished unit, and supervisory salaries. The department has one supervisor who earns $6,000 per month and can oversee production of up to 10,000 units. If production exceeds 10,000 units, a second supervisor must be hired at the same salary. How should the total cost of this department be described for a production range of 5,000 to 15,000 units?

  1. Primarily a variable cost due to the significant raw material component.
  2. A mixed cost composed of a variable element and a step-fixed element. (correct answer)
  3. A step-fixed cost because the dominant cost driver is the need for supervisors.
  4. A fixed cost because supervisory salaries are paid regardless of the exact number of units produced within a range.
Explanation: The department's total cost is the sum of its component costs. The raw materials cost is purely variable ($20 per unit). The supervisory salaries are a step-fixed cost (it's $6,000 for up to 10,000 units, then jumps to $12,000). When a variable cost is combined with a step-fixed cost, the resulting total cost behaves as a mixed cost overall, albeit one where the 'fixed' component is not a single value but changes in steps.

Question 18

An analyst is using the high-low method to determine the cost behavior of a company's utility costs. The following data from the past four months are available:

MonthMachine HoursUtility Cost
Jan3,000$12,000
Feb4,500$15,500
Mar2,500$11,500
Apr4,000$16,000

Using the high-low method correctly, what is the calculated variable utility cost per machine hour?

  1. $2.25
  2. $2.00 (correct answer)
  3. $3.00
  4. $2.50
Explanation: The high-low method identifies the highest and lowest points based on the activity level (machine hours), not the cost. The highest activity is 4,500 hours in February (cost $15,500). The lowest activity is 2,500 hours in March (cost $11,500). Variable Rate = (Cost at High Activity - Cost at Low Activity) / (High Activity - Low Activity) = ($15,500 - $11,500) / (4,500 - 2,500) = $4,000 / 2,000 hours = 2.00permachinehour.Acommonerroristousethehighestcost(2.00 per machine hour. A common error is to use the highest cost (16,000 in April) and lowest cost ($11,500 in March), which would yield an incorrect result.

Question 19

A software company pays its customer service representatives a base salary of $3,000 per month regardless of call volume. Additionally, representatives receive a $2 commission for each customer call they handle beyond 500 calls per month. In analyzing this compensation structure, management notes that when call volume increases significantly, they must hire additional representatives in groups of 5 due to training efficiency requirements. How should this compensation cost be classified?

  1. Mixed cost for individual representatives, step cost for the overall department due to hiring constraints (correct answer)
  2. Variable cost since compensation increases with call volume above the threshold level
  3. Step cost because representatives are hired in groups of 5 when volume increases
  4. Fixed cost since the base salary component represents the majority of compensation
Explanation: For individual representatives, this is a mixed cost (fixed $3,000 base + variable $2 per call over 500). However, at the department level, it becomes a step cost because representatives must be hired in groups of 5, creating discrete jumps in total cost. Choice B incorrectly focuses only on the variable component. Choice C incorrectly ignores the mixed nature of individual compensation. Choice D incorrectly emphasizes only the fixed component while ignoring the variable element.

Question 20

An automotive parts manufacturer's quality inspection department operates with the following cost structure: one quality inspector can handle up to 1,000 parts per day and costs $300 per day in wages and benefits. When production exceeds 1,000 parts, a second inspector must be added. When production exceeds 2,000 parts, a third inspector is added, and so on. However, once 4 or more inspectors are working simultaneously, a supervisor must be present, adding an additional $400 per day. If the company produces 3,200 parts in one day, what is the total inspection cost, and how should this cost behavior be classified?

  1. $1,200 total cost; this represents a step cost with uniform increments per activity level
  2. $1,200 total cost; this represents a mixed cost with both fixed and variable components
  3. $1,600 total cost; this represents a mixed cost since supervisor wages vary with inspector count
  4. $1,600 total cost; this represents a step cost pattern with multiple break points (correct answer)
Explanation: When you encounter questions about costs that change in chunks rather than smoothly, you're dealing with step cost behavior. The key is identifying how many "steps" occur and what triggers each increase. Let's work through this systematically. For 3,200 parts, you need 3,2001,000=3.2\frac{3,200}{1,000} = 3.2, which rounds up to 4 inspectors since you can't have partial inspectors. Each inspector costs $300, so inspector wages total $4 × \300 = $1,200 . Since 4 or more inspectors trigger the supervisor requirement, add another $400. Total cost: $\1,200 + $400 = $1,600$$. This exhibits step cost behavior because costs remain flat within ranges but jump abruptly at specific breakpoints (1,000, 2,000, 3,000 parts for inspectors, plus the supervisor threshold at 4 inspectors). The pattern has multiple break points with different step heights. Choice A calculates incorrectly by omitting the supervisor cost and wrongly assumes uniform increments—but the supervisor creates a different step size. Choice B misclassifies this as mixed cost, which would have both fixed and variable components that change proportionally with activity. Choice C gets the correct total but incorrectly calls it mixed cost rather than recognizing the step pattern. Remember: Step costs jump at specific activity levels and stay constant within ranges, while mixed costs have components that change proportionally. Always check for supervisory or capacity thresholds that create additional steps beyond the basic pattern.