How to work with percentages - HSPT Math

The coat is $10 cheaper than normal.

To find the answer you must first convert the sales percentage to a decimal by moving the decimal left two places yielding

Then multiply the total cost by the decimal .

We then subtract the sales number from the original cost to get the answer:

The storewide sale discounts the shirt by 50%:

Susan also has the 10% off coupon, so she's really paying 90% of the cost of the shirt:

Deducting a 20% discount is the same as charging 80% of the price, so $240.00 is 80% of the original price, which we call . Just solve this equation:

The suit originally cost $300.00

Put the percent over 100 and simplify as follows:

Note: all of these choices are equivalent to %; but only is in lowest terms.

If 15% of students ordered fish, then 85% of the students must have ordered chicken. Then multiply 85% or .

Multiply the price of the groceries before tax - $154.92 - by the decimal equivalent of 9% , which is 0.09. Round this tax to the nearest hundredth (cents), then add to the price of the groceries.

Tax:

Price after tax:

First, multiply the original price by the sale percentage:

Then, subtract that amount from the original price to get the sale price:

.

The laptop's current sale price is

First, multiply 45 by 0.37:

Then, subtract that amount from 45.00 to find the sale price:

Answer: The dress' sale price is $28.35.

Multiply:

Then, subtract that amount from the original price:

Answer: $49.60

The percentage of students who attended the field trip can be found by dividing the number present by the total number of students. Here this is divided by . You then multiply by to get the percentage.

3% of 5,319 can be calculated by multiplying 5,319 by 0.03, the decimal equivalent of 3%:

Multiply 5,319 by 3, then move the decimal point so that two digits are to the right:

,

so

Rounded to the nearest whole number, this is 160 signatures.

4% of 3,268 can be calculated by multiplying 3,268 by 0.04, the decimal equivalent of 4%:

Multiply 3,268 by 4, then move the decimal point two places to the right:

,

so

Rounded to the nearest whole number - 131 signatures.

40% of the voters were registered as independents, so 60% were registered as a member of a political party. Since 60% of the voters numbered 15,934, we can find the total number of voters by setting up and solving a proportion:

which rounds to 26,557 voters.

2% of the voters were registered as members of other parties, and 40% were unaffiliated, so we want to calculate 42% of 17,856, or, equivalently,

which, to the nearest whole number, rounds to 7,500 voters.

In order to find how much money Candy spent, we must first figure out the cost of the merchandise before the discount. We do this by adding the prices together.

Next we must find 20% of $57.00.

Since 20% is the percentage Candy saved, we must subtract $11.40 from the original price.

So Candy spent $45.60.

Translate the sentence into an equation

Isolate and you get .

Remember that the question is asking for a percentage, so convert into .

Since the jeans are the only item being purchased, and they cost $, we must first find % of $. In order to do that we multiply $ by the decimal form of %, which is .

Note: In order to find the decimal form of a percent, we divide it by .

Find the tax:

Therefore the sales tax added to the original price is $.

The final cost of the jeans is $.

When Susan's mother agreed to match her savings plus fifty percent, she agreed to give Susan % plus %.

Before multiplying by the amount Susan saved, we must convert % to a decimal by dividing by .

Now we multiply time $.

Susan's mother owes her $.