This collection of programs calculates the compound interest function n, i, PV, PMT, and FV using the actuarial method. This means that the value for n can be any real number. Calculations using a negative or non-integer value for n produce a mathematically correct result, but this has no simple useful interpretation.
The first program calculates n, PV, PMT, or FV. The second program, a shorter version of the first program, calculates only n. The third program calculates i.