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All courses Math Foundations · MF.RN.8 14 of 60
Solve discount, markup, tax, tip, and simple interest style percent problems.

Apply a percent discount

Problem
A jacket originally costs $80. It is on sale for 25% off. What is the sale price?
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Hint

Change 25% to 0.25, then use it with the original price of 80 to find the discount amount first.

Percent off means find that percent of the original price, then subtract it from the original to get the sale price.

Solution walkthrough

01

Identify what 25% off means

\[25\%~=~0.25\]

A 25% discount means you remove 25 hundredths of the original price. Writing the percent as 0.25 makes it easy to multiply.

02

Find the discount amount

\[0.25~\times~80~=~20\]

The discount is 25% of the original $80 price, so the amount taken off is $20.

03

Subtract the discount from the original price

\[80~-~20~=~60\]

A sale price is the original price minus the discount. Subtracting the $20 discount from $80 gives the reduced price.

04

State the sale price

\[\$60\]

The jacket’s sale price is $60.

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Another way

  1. Since 25% off means you pay 75% of the price, you can compute 0.75 × 80 = 60 directly.

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Common mistake

Finding the discount correctly as $20 but giving $20 as the final answer. This problem asks for the sale price, so you must subtract the discount from $80.