The ANNUITY function returns a numeric value that approximates the ratio of an annuity paid at the end of each period, for a given number of periods, at a given interest rate, to an initial value of one. The number of periods is specified by argument-2; the rate of interest is specified by argument-1. For example, if argument-1 is zero and argument-2 is four, the value returned is the approximation of the ratio 1 / 4.
The function type is numeric.
Format >>-FUNCTION ANNUITY--(--argument-1 argument-2--)---------------><
1 / ARGUMENT-2
ARGUMENT-1 / (1 - (1 + ARGUMENT-1) ** (- ARGUMENT-2))