利息的计算方法有单利和复利两种。单利法:只对最初的本钱计算利息的方法。通常用于计算短期利息。例如:S=Px(1+ni)p—本钱i—一定期间的利率n—期间s—本利和复利法:把每隔一定期间的利息转入本钱得到本利和作为下期的本钱重复计算求得再下一期的本利和的方法。符号和上面相同。 There are two methods for calculating interest: simple interest and compound interest. Single benefit method: only the initial cost of interest calculation method. Usually used to calculate short-term interest. For example: S = Px (1 + ni) p- capital i-interest rate for a certain period n-period s-profit and compound law: the interest of every fixed period of time to get the capital to profit and as the next period of capital calculated repeatedly The next phase of the benefits and methods. The symbols are the same as above.