1. Contents Percentages Percentage Change Percentages

2. A percentage is a fraction in which the denominator is equal to 100. Percentages Example 1 For example, Change each of the following into percentage. (a) 0.83 (b) Solution :

3. When an original value is changed to a new value, the percentage change of the value can be measured in the following way. Original – New = X original 100 To find a change…you subtract!!! Percentage Change

4. Example 1 Solution : Peter’s weight decreases from 60 kg to 48 kg. Find the percentage change of his weight. Percentage decrease of weight is 20 %.

5. Discount is a price deduction from a marked price in purchasing. Discount Example 2 Solution : The marked price of a washing machine is $4500. If the selling price is $3000, find the discount percentage.

6. Percentages 1 Examples 3 A rose bush grew from 20 inches to 40 inches. Is that a percent increase or decrease? How do we set up our proportion? Original and new = x original 100 40 - 20 = x 20 100 20 x 20 100 100% increase

7. Percentages 1 Example 4 Jim received a raise at work. His original salary was 10.00 and hour. His new salary is 12.00 an hour. What percent did his salary change? Is this a percent increase or decrease? How do we set up our proportion? 12.00 – 10.00 = x 12.00 100 Answer: close to a 17% increase