On Friday, August 8, 2014 12:24:44 PM UTC-4, wrote:

I do have a handy little DOS program that does most of this kind of
math (Mortgage calculator, loan tables etc and it includes a "time for
withdrawal" that computes how long it takes to deplete a fixed amount
of money invested at a particular interest rate.

This is a tiny program and it seems to run fine on any windoze
platform.

I have something that can do the same thing. It's called a CPA wife. Operating requirements are a bit more expensive, er, extensive though. :-