GMAT Math : DSQ: Calculating discounts

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Example Question #83 : Word Problems

Susan went to a clearance sale and bought various items on sale. She saves 20% on a purse, retailing for $100. She saves 30% on a skirt that was marked down from a retail price of $40. She also bought a jacket that was on sale, and she spent a total of $150 . How much did the jacket retail for?

1. Her overall savings were 25% off the combined retail price of all three items.

2. Her discount on the jacket was $6 more than her savings on the skirt. 

 

Possible Answers:

Each statement alone is sufficient.

Both statements taken together are sufficient to answer the question, but neither statement alone is sufficient.

Statement 2 alone is sufficient, but statement 1 alone is not sufficient to answer the question.

Statement 1 alone is sufficient, but statement 2 alone is not sufficient to answer the question.

Statements 1 and 2 together are not sufficient.

Correct answer:

Each statement alone is sufficient.

Explanation:

Using statement 1, it is easy to see how much the total retail amount should have been. The total retail amount discounted by 25% is the amount that Susan spent. So, we name a variable. Let x be the total retail amount. Then x - .25x = $122. We can rewrite this as x(1-.25) or x(.75)=150 thus, x = 200. So we subtract the known retail prices of the skirt and the purse to get the retail price of the jacket. So 200 - 100 - 40 = $60 is the retail price of the jacket.

Now, we should check statement 2. Using statement 2, we can calculate the savings we had on the jacket. We can first calculate how much we saved on the skirt. So 30% of the $40 retail price is $12. After we find this, we use the information from statement 2 to find the savings we had on the jacket. So $12 + $6 = $18 saved on the jacket. 

Now, we need to figure out how much we spent on the jacket. We do this by taking the total amount we spent and subtracting the discounted price of the purse and the discounted price of the skirt. So, a $100 purse, at 20% off, is $80. We calculated our savings on the skirt earlier, so we know we spent $28 on the skirt. So $150 - $80 - $28 = $42.

Now combining these two pieces of information, we see we spent $42 and saved $18 so 42+18 = $60 retail price for the jacket. 

We can see that either statement alone is sufficient to solve the problem.

Example Question #86 : Word Problems

Data sufficiency question

During a semi-annual sale, the price of a shirt is discounted. Calculate the percent discount.

1. The sale price is $23.

2. The sale price is $6 less than the original price.

Possible Answers:

Each statement alone is sufficient

Statements 1 and 2 together are not sufficient, and additional data is needed to answer the question

Both statements taken together are sufficient to answer the question, but neither statement alone is sufficient

Statement 2 alone is sufficient, but statement 1 alone is not sufficient to answer the question

Statement 1 alone is sufficient, but statement 2 alone is not sufficient to answer the question

Correct answer:

Both statements taken together are sufficient to answer the question, but neither statement alone is sufficient

Explanation:

In order to calculate the percent discount, both the original price and the sale price must be known. From statement 1, we know the sale price and with the additional information from statement 2, we can calculate the original price and then overall percent discount.

Example Question #1 : Dsq: Calculating Discounts

A store owner applies a certain percentage of discount on items bought by customers who have a rewards card. What is the percentage of discount applied?

(1) A customer without a reward card pays 1.5 times what a customer with a reward card pays on the same articles.

(2) A customer with a reward card pays two thirds of any listed price.

Possible Answers:

Statements (1) and (2) TOGETHER are not sufficient.

Each Statement ALONE is sufficient.

Both statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient.

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient.

Correct answer:

Each Statement ALONE is sufficient.

Explanation:

(1) A customer without a reward card pays 1.5 times what a customer with a reward card pays on the same articles.

Let x be the price a customer with a reward card pays, a customer without a reward card pays 1.5x, 1.5x being the original selling price. We can calculate the percentage of discount as:

Statement (1) is sufficient.

 

(2) A customer with a reward card pays two thirds of any listed price.

Let y be the listed price of a given article. A customer with reward card pays .

The percentage of discount is:

Statement (2) is sufficient.

Each Statement ALONE is sufficient.

 

Example Question #88 : Word Problems

What is the amount of tuition for a MBA degree at University X?

(1) Students with a GMAT score above 700 receive a 50% discount on the tuition.

(2) The average tuition paid by 5 students is $50,000, if only 2 of these students received a 50% discount.

Possible Answers:

Each Statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are not sufficient.

Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient.

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient.

Both statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

Correct answer:

Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient.

Explanation:

(1) Students with a GMAT score above 700 receive a 50% discount on the tuition.

Statement (1) is not sufficient as we do not know how much half of the tuition is.

(2) The average tuition paid by 5 students is $50,000, if only 2 of these students received a 50% discount. Let x be the full amount of tuition for the MBA program.

Statement(2) Alone is sufficient.

Example Question #2 : Discount

How many dollars does Jane save when using a coupon to buy a purse at a local store?

(1) The original price of the purse is $400.

(2) When using the coupon, Jane saves 25%.

Possible Answers:

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient.

Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient.

Both statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

Each Statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are not sufficient.

Correct answer:

Both statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

Explanation:

Note that the question does not ask for the percentage of discount but the amount of money saved.

(1) The original price of the purse is $400.

Statement (1) alone is not sufficient because it only gives the selling price prior to using the coupon.

(2) When using the coupon, Jane saves 25%.

Statement (2) alone is not sufficient. Even though we know the percentage of discount, we do not have the original price.

However, combining both statements, we get the amount of money saved as:

Jane saved $100 by using the coupon.

Both statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

Example Question #92 : Word Problems

What is the new price on a car after a certain promotional offer is applied?

(1) The promotional offer is equivalent to a $4000 cash back card.

(2) The original price of the car is 1.2 times the new price after the promotional offer.

Possible Answers:

Statements (1) and (2) TOGETHER are not sufficient.

Each Statement ALONE is sufficient.

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient.

Both statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient.

Correct answer:

Both statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

Explanation:

(1) The promotional offer is equivalent to a $4000 cash back card.

Statement (1) alone is not sufficient because we do not know the original price of the car.

(2) The original price of the car is 1.2 times the new price after the promotional offer.

Using the information statement (2), we can write:

Let x be the original price of the car and y the price after the promotional offer

Statement (2) alone is not sufficient.

Combining both statements:

 

We can calculate the original price as:

So we can find the new price:

Example Question #2 : Dsq: Calculating Discounts

A lawn-mower is initially offerred at . Its price is discounted off the full price. What is the final price?

Possible Answers:

Correct answer:

Explanation:

If the initial price is , and the discount is , the final sale price is


 

 

Example Question #3 : Dsq: Calculating Discounts

A lawn-mower is discounted off the full price. A second discount of is applied at the register. What is the final discount?

Possible Answers:

Correct answer:

Explanation:

If the initial price is P, and it is discounted twice at rates  and , the final price  is

Substituting values this is

 

or 

Example Question #95 : Word Problems

A lawn-mower is initially listed at . Its price is discounted off the full price some unknown amount, . An employee uses their  discount at the register and is charged .

What is the unknown initial discount,?

Possible Answers:

Correct answer:

Explanation:

The relationship between the list price, , sale price, , and the employee's discount, , is

Inserting values and re-organizing:

Example Question #4 : Dsq: Calculating Discounts

A lawn-mower is initially listed at . Its price is discounted  off the full price. How much does the customer save relative to the initial list price?

Possible Answers:

Correct answer:

Explanation:

If the initial price is , and the discount is , the savings are

 

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