“本金的”造句

利息按照某个比例在本金的基础上每年计算一次.
Interest is reckoned as a certain percentage yearly on the principal.

5000美元本金的利息是多少?
How much interest will there be on a principal of  5000?

总偿付额是本金的利息和 分期付款 偿付额的不同组合.
The total payment is a varying combination of both interest and repayment ( amortization ) of principal.