1. Sec 3.4 Finding Rate ObjectivesObjectives – Use the basic percent formula to solve for rate – Find the rate of return when the amount of the return and the investment are known – Solve for the percent remaining when the total amount used are given – Find the percent of change

2. Finding Rate As in Sec. 3.3, we can use our mnemonic device to help us remember the formula for finding rate. Part Part Rate = -------- Base Base

3. Finding Rate When finding rate, always express your answer as a percent.

4. To find percent increase: 1)First find the amount of increase by subtracting the smaller value from the larger value. Amt of Increase = Larger - Smaller Amt of Increase = Larger - Smaller Value Value Value Value 2)Next, find the percent increase by dividing the amount of increase by the original amount. 2)Next, find the percent increase by dividing the amount of increase by the original amount. % Increase = % Increase = 3)Finally, express your answer as a percent.

5. To find percent decrease: 1)First find the amount of decrease by subtracting the smaller value from the larger value. Amt of Decrease = Larger - Smaller Amt of Decrease = Larger - Smaller Value Value Value Value 2)Next, find the percent decrease by dividing the amount of decrease by the original amount. 2)Next, find the percent decrease by dividing the amount of decrease by the original amount. % Decrease = % Decrease = 3)Finally, express your answer as a percent.

6. We can summarize the above two sets of formulas into a single set of formulas-- use the context of the problem to determine whether it is a percent increase problem or percent decrease. Percent Change 1) Amount of Change = Larger Value – Smaller Value 2) Percent Change = 3) Write your answer as a percent.

7. Homework Sec 3.4 Divisible by 3