1. Course 2, Lesson 2-8 Find the sale price to the nearest cent. 1. $120 jacket; 30% discount 2. $10,500 car; 10% discount 3. $35 sweater; 18% discount; 3% tax 4. An employee at a restaurant receives a 60% discount on meals. If the total before the discount is $32.50, how much does the employee pay? 5. A shirt is advertised “Buy 1, Get 1 50% off.” If the original price of every shirt is $12.98 and you take advantage of the special offer, what is the price you would pay per shirt? 6. A hotel room costs $155 per night. What is the total cost with a 30% discount and 5.5% sales tax?

2. Course 2, Lesson 2-8 ANSWERS 1. $84 2. $9,450 3. $29.56 4. $13 5. $9.74 per shirt 6. $114.47

3. HOW can percent help you understand situations involving money? Ratios and Proportional Relationships Course 2, Lesson 2-8

4. Ratios and Proportional Relationships Course 2, Lesson 2-8 Common Core State Standards © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved. 7.RP.3 Use proportional relationships to solve multistep ratio and percent problems. 7.EE.3 Solve multistep real-life and mathematical problems posed with positive and negative rational numbers in any form (whole numbers, fractions, and decimals), using tools strategically. Apply properties of operations to calculate with numbers in any form; convert between forms as appropriate; and assess the reasonableness of answers using mental computation and estimation strategies.

5. Ratios and Proportional Relationships Course 2, Lesson 2-8 Common Core State Standards © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved. Mathematical Practices 1Make sense of problems and persevere in solving them. 3Construct viable arguments and critique the reasoning of others. 4Model with mathematics.

6. How to use the simple interest formula to: Find interest earned on saving accounts Find interest owed on loans and credit cards Ratios and Proportional Relationships Course 2, Lesson 2-8

7. Ratios and Proportional Relationships Course 2, Lesson 2-8 principal simple interest

8. Ratios and Proportional Relationships Course 2, Lesson 2-8

9. Ratios and Proportional Relationships Course 2, Lesson 2-8 Words Simple interest l is the product of the principal p, the annual interest rate r, and the time t, expressed in years. Symbols l = prt

10. How did what you learned today help you answer the HOW can percent help you understand situations involving money? Course 2, Lesson 2-8 Ratios and Proportional Relationships

11. Course 2, Lesson 2-8 Ratios and Proportional Relationships

12. Course 2, Lesson 2-8 Ratios and Proportional Relationships

13. Course 2, Lesson 2-8

14. Ratios and Proportional Relationships

15. Course 2, Lesson 2-8 Ratios and Proportional Relationships

16. Course 2, Lesson 2-8 Ratios and Proportional Relationships

17. Course 2, Lesson 2-8 Ratios and Proportional Relationships

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19. Course 2, Lesson 2-8 Ratios and Proportional Relationships

20. How did what you learned today help you answer the HOW can percent help you understand situations involving money? Course 2, Lesson 2-8 Ratios and Proportional Relationships

21. How did what you learned today help you answer the HOW can percent help you understand situations involving money? Course 2, Lesson 2-8 Ratios and Proportional Relationships Sample answers: Interest rates are written as percents. You can find the amount of simple interest earned on a savings account. You can find the amount of interest charged on bank loans and credit cards.

22. Would you prefer to deposit $1,000 at a simple interest rate of 3% for 5 years or $1,000 at a simple interest rate of 4% for 4 years? Explain your reasoning. Ratios and Proportional Relationships Course 2, Lesson 2-8