Great blog post by Peter Gibbons, Michael Bolton, and Samir "Nagana-work-here-anymore" about their time at Initech

https://www.youtube.com/watch?v=yZjCQ3T5yXo

"all right so when the subroutine compounds the interest, it uses all of these extra decimal places that just get rounded off. So we simplified the whole thing, we round them all down and drop the remainder... in to an account that we opened"