Find each percent of change. Round answers to the nearest tenth of a percent, if necessary. A. 65 is decreased to 38.
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1 LESSON 6-6 Percent of Change Lesson Objectives Solve problems involving percent of change Vocabulary percent of change (p. 352) percent of increase (p. 352) percent of decrease (p. 352) Additional Examples Example 1 Find each percent of change. Round answers to the nearest tenth of a A. 65 is decreased to Find the amount of. percent of change Substitute values into the formula Divide. % Write as a percent. Round. The percent of decrease is about %. B. 41 is increased to Find the amount of change. Percent of change Substitute values into the formula Divide. % Write as a percent. Round. The percent of increase is about %. 153 Holt Mathematics
2 LESSON 6-6 Percent of Change Lesson Objectives Solve problems involving percent of change Vocabulary percent of change (p. 352) The amount stated as a percent that a number increases or decreases. percent of increase (p. 352) A percent change describing an increase in a quantity. percent of decrease (p. 352) A percent change describing a decrease in a quantity. Additional Examples Example 1 Find each percent of change. Round answers to the nearest tenth of a A. 65 is decreased to Find the amount of change. percent of change Substitute values into the formula Divide % Write as a percent. Round. The percent of decrease is about 41.5 %. B. 41 is increased to Find the amount of change. Percent of change Substitute values into the formula Divide % Write as a percent. Round. The percent of increase is about %. 153 Holt Mathematics
3 Example 2 The regular price of a bicycle helmet is $ It is on sale for 20% off. What is the sale price? Step 1: Find the amount of the discount. 20% d Think: 20% of $42.99 is what number? d d $ d Round to the nearest cent. The discount is $. Step 2: Find the sale price. regular price amount of discount sale price $42.99 $ $ The sale price is $. Example 3 A boutique buys hand-painted T-shirts for $12.60 each and sells them at a 110% increase in price. What is the selling price of the T-shirts? Step 1: Find the amount n of increase. Think: 110% of $12.60 is what number? 110% n n n The amount of increase is $. 154 Holt Mathematics
4 Example 2 The regular price of a bicycle helmet is $ It is on sale for 20% off. What is the sale price? Step 1: Find the amount of the discount. 20% d Think: 20% of $42.99 is what number? d d $ 8.60 d Round to the nearest cent. The discount is $ Step 2: Find the sale price. regular price amount of discount sale price $42.99 $ 8.60 $ The sale price is $ Example 3 A boutique buys hand-painted T-shirts for $12.60 each and sells them at a 110% increase in price. What is the selling price of the T-shirts? Step 1: Find the amount n of increase. Think: 110% of $12.60 is what number? 110% n n n The amount of increase is $ Holt Mathematics
5 Step 2: Find the selling price. Think: retail price wholesale price amount of increase. p $12.60 $ p $ The selling price of the hand-painted T-shirts is $ each. Try This 1. Find the percent of change. Round answers to the nearest tenth of a 70 is decreased to The regular price of a computer game is $ It is on sale for 15% off. Find the sale price. 3. William makes T-shirts for $7.00 each and sells them after a price increase of 125%. What is the selling price of the T-shirts? 155 Holt Mathematics
6 Step 2: Find the selling price. Think: retail price wholesale price amount of increase. p $12.60 $ p $ The selling price of the hand-painted T-shirts is $ each. Try This 1. Find the percent of change. Round answers to the nearest tenth of a 70 is decreased to 45. The percent of decrease is about 35.7%. 2. The regular price of a computer game is $ It is on sale for 15% off. Find the sale price. $ William makes T-shirts for $7.00 each and sells them after a price increase of 125%. What is the selling price of the T-shirts? $ Holt Mathematics
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