Simple Interest is calculated using the formula I = Prt, where:
我们可以使用公式I=Prt计算简单利息，其中：
I is the interest
P is the principal amount of money you put into the account (that is the amount of money initially invested or borrowed)
R is the annual rate of interest that you get (that is the rate at which interest is charged, as a percent (expressed as a decimal for calculations), per year)
T is the time that the money is in the account (and is measured in years).
I是利息
P是存入账户的本金（即最初投资或借款的金额）
R是每年获得的利率（即收取利息的利率，以百分比（表示为小数点进行计算）表示）
T是资金进入账户的时间（以年为单位）
When you take out a loan, you are the borrower and you pay interest. When you deposit money at a financial institution, the bank is the borrower and you earn interest.
At the end of the lending period, the amount, A, repaid by the borrower to the lender is the sum of the principal and the interest.
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