7th Grade Math

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Applying Percents

PART A BCD EF

Multi-Part

Lesson 3

GLE 0706.2.4

Use ratios, rates and

percents to solve single-

and multi-step problems

in various contexts. Also

addresses GLE 0706.1.4.

Main Idea

Solve problems

involving discount.

Vocabulary

discount

Discount

WATER PARKS A pass at a water park

is $58. Halfway through the season,

the pass is discounted by 20%.

1. Calculate the discount by finding
   20% of $58. Round to the
   nearest cent.


2. What will be the discounted price?


3. Multiply 0.8 and $58. How does the result compare to your answer
   in Exercise 2?
   Discount is the amount by which the regular price of an item is
   reduced. The sale price is the regular price minus the discount.

DVD s A DVD normally costs $22. This week it is on sale for 25%

off the original price. What is the sale price of the DVD?

Method 2 Subtract the percent of discount from 100%.

100% - 25% = 75% Subtract the discount from 100%.

The sale price is 75% of the regular price.

75% of $22 = 0.75 × $22 Write 75% as a decimal.

= $16.50 Multiply.

Method 1 Subtract the discount from the regular price.

First, find the amount of the discount.

25% of $22 = 0.25 × $22 Write 25% as a decimal.

= $5.50 The discount is $5.50.

Next, subtract the discount from the regular price.

$22 - $5.50 = $16.50

The sale price of the DVD is $16.50.

a. CLOTHES A shirt is regularly priced at $42. It is on sale for 15%

off. What is the sale price of the shirt?

Lesson 3D Applying Percents 355

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