Problem with MVAR on HP42S

[Werner]

I had to try that out, too: NPV and IRR

I you want it to work like yours, you can leave out the lines referring to NPV:
(line 05 MVAR "NPV" and line 57 RCL- "NPV")
Then, to get the IRR, SOLVE the program "NPV".
To get the NPV, provide the values for CF0, CFj and IRR% (you can do that interactively with VARMENU "NPV", that is shift-PGM FCN, up, VARM) , and XEQ "NPV".

Cheers, Werner