Depreciation - different results on HP30b and on paper

[FabioBrasil]

Paul0207, Thank you very much!
You solved the problem with Factor = rate * lifetime. In the Declining Balance mode (DecBal) this made me arrive at the same values of the exercise. Many, many thanks to all the colleagues who taught me a lot!

Paul0207, most things are the same on the HP12C and the HP30b. So much the same, that I use programs written for the HP12c on the HP30b with few modifications. And you don't need to apologize for anything, I appreciate your help!