Question

The price of a microwave oven went up from $75

to $90; then went on sale for $57. What is the

percent decrease from the original price to the

sale price?

Answer 1

Answer: 24% decrease

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Work Shown:

Ignore the value 90 as we never use it in this problem.

A = old value = 75

B = new value = 57

C = percent change

C = 100*(B-A)/A

C = 100*(57-75)/75

C = 100*(-18/75)

C = 100(-0.24)

C = -24%

The negative C value indicates a percent decrease.

Going from $75 to $57 is a 24% decrease.

Answer 2

The percent decrease of the microwave from the original price to the sale price is 24%

Explanation:

1. Let's review the information given to us to answer the question correctly:

Original price of a microwave = $ 75

Mark-up price of the microwave = $ 90

Sale price of the microwave = $ 57

2. What is the percent decrease from the original price to the sale price?

For answering this question we will use the Direct Rule of Three this way:

Price Percentage

75 100%

57 x

75x = 57 * 100

75x = 5,700

x = 5,700/75

x = 76

76 = 100 - 24

The percent decrease of the microwave from the original price to the sale price is 24%