What is defined as the investment of loan or principal which is based not only on the original amount of the loan or principal but the amount of loaned or principal plus the previous accumulated interest ?

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What is defined as the investment of loan or principal which is based not only on the original amount of the loan or principal but the amount of loaned or principal plus the previous accumulated interest ?

A. Effective rate of interest
B. Nominal rate of interest
C. Compound interest
D. Simple interest