每元现值每期付款数

periodic payment present discount value excess present value index present capital value present discounted value present value index capitalized present value present value criterion net present value index present value depreciation periodic proper value mean value periodic quantity periodic payment with present value of l yuan present value of 1 per period present value of annuity present value of ordinary annuity present value of l yuan present value of income from investment net present value of income from investment financial net present value of foreign exchange present value payment with letter of credit