Fill in the Blank with One of the Words or Phrases

Fill in the blank with one of the words or phrases listed below. Some words may be used more than once. $\begin{array}{lllllll}\text { not equal } & \text { equal } & \text { compound interest } & \text { cross products } & \text { percent } & \text { is } & \text { sales tax } \\\text { unit rate } & \text { ratio } & \text { percent of decrease } & \text { unit price } & \text { base } & \text { of } & \text { amount }\\0.01 & \frac{1}{100} & \text { amount of discount } & \text { proportion } & \text { total price } \\100 \% & \text { rate } & \text { percent of increase } & \text { sale price } & \text { commissio }\\\end{array}$
-______is computed not only on the principal, but also on interest already earned in previous compounding periods.

A) Compound interest
B) Percent
C) Base
D) Amount