Now let's look closer at the method used to derive compound interest：
现在让我们更仔细地看一下用来计算复利的方法；
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The interest that is added to the principal before the new interest earned is calculated. So interest is calculated on the principal and on interest already earned. Interest is paid at regular time intervals called the compounding period.
在计算新获得的利息之前加在本金上的利息。所以利息是根据本金和已经赚取的利息计算的。利息按固定的时间间隔支付，称为复利期。
In Compound Interest, the Amount is calculated using the formula
计算的，其中：
I is the interest rate per compounding period (changed into a decimal).
P is the principal amount of money you invest or borrowed.
A is the amount you end up with or owe.
N is the number of compounding periods.
I是每个复利期的利率（改为小数）。
P是你投资或借款的本金。
A是你最终拥有或欠下的金额。
N是复利期的数目
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