> If you design software that works with money amounts, always use fixed point decimals. Don't use floats, it's just wrong!

I find it funny the gap between what computer people think finance requires and actual practice.

The tax people in the US generally aren't interested in pennies any more! And when you use tax software that throws away the pennies before the final results, then your sums may very well not match the forms whose information is independently reported to the IRS, by well over a dollar. But nobody cares!