Use this function to calculate the amount of money needed to be invested at a fixed rate today, to receive a specific amount, an annuity, over a specified number of periods. You can also determine how much money is to remain after the elapse of the period. Specify as well if the amount is to be paid out at the beginning or at the end of each period.
借助这个函数您能够计算为了在各个周期内(周期总数确定)获得预定的分期支付金额(年金)，目前必须投资的金额数值。在此您既可以指定在完成最后一次支付后还剩余的应支付金额数，又可以指定支付是在周期开始还是周期结束时到期。