In the days before
"Floating Point Units" in computers

floating point computers have been around since the 1950's. I have seen early
60's such machines still in use.

accounting computers used integer arithemtic because the calcs were quicker.

If your coding skills were 0.1% of what you claim you could easily use an
interger machine to get as many decimal places as you wanted. It was commonly
done, by freshmen in college.