1. 2.9 PERCENTS I can solve percent problems using proportions or the percent equation.

2. THE PERCENT PROPORTION

3. USING PROPORTIONS

4. PRACTICE  What percent of 56 is 42?  75%  What percent of 90 is 54?  60%

5. THE PERCENT EQUATION

6. PRACTICE  Using the percent equation, what percent of 30 is 18?  60%  What percent of 56 is 35  62.5%

7. FINDING A PART  A dress shirt that normally costs $38.50 is on sale for 30% off. What is the sale price?  a = 30% ∙ 38.50 will tell you how much is taken off  Or you can use a = 70% ∙ 38.50 to tell what the price will be  $26.95

8. FINDING A BASE

9. SIMPLE INTEREST FORMULA

10. EXAMPLE  If you invest $50 at a simple interest rate of 3.5% per year for 3 years, what is the amount of interest earned?  I = this is what we’re solving for  P = 50  r = 3.5% = 0.035  t = 3  I = $5.25

11. ASSIGNMENT  ODDS ONLY  P.141 #9-29