1. The word percent means:
1 8 =.125=12.5%

2. Express as a decimal: 1 100 %=
Check Point 3: 2.3%
Check Point 3: a b. 2.5
Express as a decimal: %=

3. Three types of % problems
What is 3% of 200?
is 60% of what number?
is what percent of 90? 6 5
20%

4. Sales Tax
The book on page 490 gives a formula 𝐴=𝑃∙𝐵 we will not be using this formula.
Check Point 4: a. $75.60 b. $

5. Discount
Check Point 5: a. $133 b. $247

6. Percent and Change
Percent increase and percent decrease can be found by the following formulas:

7. Check Point 6: a. 10−6 6 = 2 3 =𝟔𝟔 𝟐 𝟑 % b. 10−6 10 = 2 5 =40%

8. Abuses of Percent
225% is not “an increase of more than 300%.”

9. Math XL Problems