(12C) Actuarial Calculations

[Joe_H]

(05-12-2018 05:41 AM)Gamo Wrote:  Since HP 12C always calculate [n] as an Integer with rounding up result.
Program below help solve this problem to get result with fractional part and [n] can be input with fractional part by using the Actuarial Method.

*Program to calculate [i] and use fractional [n]

Gamo

As far as I can make out the HP12C does use non-integer n for i calculation. The only difficulty is calculating a non-integer n. I tried it on mine and got the correct i value for a non-integer n.

For example:
PV = -100
FV = 111.10 (PMT=0)
n = 1.1
i calculates as 10% which is correct

But:
PV = -100
FV = 111.10 (PMT=0)
i = 10%
n calculates as 2 which is the problem.

The TI BAII Plus (other permitted CFA calculator) does calculate n correctly for these TVM inputs.

As far as I can make out the first program (and longer one) isn't required but the second one is useful and I'll try it now.

Joe