With , the interest earned on your savings in a given time period is added to the money in your savings account, and the new total (principal plus interest) earns more interest.

The correct answer is letter "A": compound interest.

Explanation:

Compound Interest is the interest that the investor earns on his original investment plus all interest earned on the interest accumulated over time. Compound interest is often referred to as interest on interest. Compound interest is based on the initial interest and often takes into account all the accrued interest on a deposit or loan from previous periods.

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