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

[Albert Chan]

(05-13-2024 07:07 PM)Albert Chan Wrote:  lua> ipy, ppy, cpy = .05, 12, 3 -- (I/Yr), (P/Yr), (I/Yr)
lua> i = expm1(log1p(ipy/cpy) * cpy/ppy)
lua> i
0.004140875317607807

It may be easier to use APR, EFF functions for i (if we have them)

lua> APR = fn'i,n: expm1(log1p(i)/n)*n'
lua> EFF = fn'i,n: expm1(log1p(i/n)*n)'
lua> APR(EFF(ipy, cpy), ppy) / ppy
0.004140875317607807

TI BA-35 Solar

5 [►EFF] 3 =    → 5.083796293
[►APR] 12 =     → 4.969050367
[÷12]               → 0.414087531