Compound interest is interest paid on the loan amountminus the length of the loan.minus any interest that has accumulated.plus any interest that has accumulated.plus the length of the loan.

Compound interest is calculated on the original loan amount plus any interest that has already accumulated. For example, if $100 earns $5 in interest, the next interest calculation is based on $105. Therefore, the correct choice is “plus any interest that has accumulated.”

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