HP 10bii+ Margin/Markup bug

[Gamo]

Sorry for this one cause is not HP related.

I program this Pricing Calculations using the Python code.

This code can be run and view the code on the web.

So that one who really interest can see the algorithm I used
for this program.

Link: https://trinket.io/python/656c020f51?runOption=run

For choice Program #1

Enter the two unknown with 0
If enter 0 on both Cost and Price one of the Markup and Margin must
Have a value so this can be converted between MU and MAR

Gamo