Calculate the present value of a level annuity and the total amount discounted over the payment period.
每期期末等额收款 PMT、共 N 期、每期利率 i 的年金现值。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Present value of an annuity | PV = PMT·[1 − (1+r)^(−n)] / r | Standard time-value-of-money (Brealey & Myers) |