Finance problems (TVM) on hp 49G+ hp 50G Periods and compounds per year are different

[Albert Chan]

There is nothing special about a Year, we could go directly for i

I%/Yr = 5, C/Yr = 3                            → 12/3 = 4 months, $3 will grow to $3.05

Less keys to type, faster to calculate, and more accurate!

HP-12C, mode=END

4 [N] -3 [PV] 0 [PMT] 3.05 [FV] [I]      → 0.414087532
60 [N] 3E4 [PV] 0 [FV] [PMT]              → -565.7117264, Error = 0 ULP

Note for HP-12C: above work only if N is positive integer (too bad...)