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# Lesson 2-7

Lesson 2-7. Percent of Change. The Essential Question. Why is it important to be able to express algebraic expressions in different way? Answer:. A short review. More Review. The _________ oz is the best buy. Objective:. Find the percent of change

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## Lesson 2-7

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1. Lesson 2-7 Percent of Change

2. The Essential Question • Why is it important to be able to express algebraic expressions in different way? • Answer:

3. A short review

4. More Review The _________ oz is the best buy.

5. Objective: • Find the percent of change • Solve problems involving percent of change Vocabulary: Percent of change Percent of increase Percent of decrease

6. Some examples and practice:

7. Percent of Change • Determine whether the percent of change is a percent of increase or a percent of decrease Then find the percent of change. • Original: 32 • New: 40 • Find the amount of change. Since the new amount is __________ than the original, the percent of change is the percent of __________. • Find the percent using the original number, 32, as the base. • Change to percent

8. Real World Problem: • The price a used-book store pays to buy a book is \$5. The store sells the book for 28% above the price that it pays for the book. What is the selling price of the book? • Let s = the selling price of the book

9. More Real World Examples

10. More Applications

11. Check your progress… • A baseball cap is on sale for 15% off the original price. I the original price of the cap is \$19.99, what is the discounted price?

12. Activities for the rest of the day • Mid-chapter quiz • When your quiz is complete, work on your homework, quietly

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