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Section 8.1 D2 Percents Math in Our World

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Learning Objectives Find percent increase or decrease. Evaluate the validity of claims based on percents.

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Problems Involving Percents Procedure for Finding Percent Increase or Decrease Step 1 Find the amount of the increase or the decrease. Step 2 Make a fraction as shown: Step 3 Change the fraction to a percent.

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EXAMPLE 10 Finding a Percent Change A large latte at the Caffeine Connection sells at a regular price of $3.50. Today it is on sale for $3.00. Find the percent decrease in the price.

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EXAMPLE 11 Recognizing Misuse of Percents in Advertising A department store advertised that certain merchandise was reduced 25%. Also, an additional 10% discount card would be given to the first 200 people who entered the store on a specific day. The advertisement then stated that this amounted to a 35% reduction in the price of an item. Is the advertiser being honest?

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Classwork p. 428: 41, 43, 53, 55, 57

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