**Understanding Percent Problems**

- the base ( B ) or whole or total amount, a standard used for comparison
- the portion ( P ) or part being compared with the base
- the rate ( R ) or percent, a percent number

**Identify the Parameters:**

*Example*: What is 20% of 280?

- is indicates the portion (or percent) P to be found.
- % indicate the percent rate R, here R = 30%
- of indicates the base B which is equal to 280.

**Finding the percent of a number**

- Change the rate (percent form) to a decimal and
- Multiply the base amount by this decimal

- What is 40% of 70?
- Find 40% of 70.
- 40% of 70 is what number?

- Change 40% into decimal:

40% = 0.40 - Multiply the number by the decimal:

70 x 0.40 = 28

**28 represents 40% of 70**