HP-65 Financial Software request

[Don Shepherd]

(01-07-2019 02:38 PM)albertofenini Wrote:  Dear All,
I would like to implement on an HP-65 a software program that given any two of these three values : Cost, Sell, Margin will give in return the third one.
It is a very common function on a Financial Calculator and I'd like to have it on the HP-65
Does anyone has ever done something similar and would like to share ?
Thanks in advance Alberto

Alberto, I'm not familiar with these financial terms, but if there is a formula that derives them, can't you just program that?