1. D. Percentage
2. A. Base
3. C. Rate
4. C. Rate

• Percentage - is a ratio of a number to 100
• Rate/Percent - The ratio of amount to the base. It is written as a percent
• Base - The whole in a problem. The amount you are taking a percent of.
• Ratio - A ratio is an ordered pair of numbers a and b, written a / b where b does not equal 0. A proportion is an equation in which two ratios are set equal to each other.

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