Compounding Interest: I thought this was a simple formula(s) to memorize. Just remember to subtract from 1 for module degradation and inflation. Add to one for interest rates.
I think a lot of textbooks make things as difficult as possible to understand, because the author is trying to impress the other instructors.
Glad you think it is simple to understand.
"Everything Should Be Made as Simple as Possible, But Not Simpler"