Rule of Thumb:
To calculate dollars "accurately" with 2 decimal places, you need
to calculate right from the beginning in cents as integers!
So just calculate with integers in the desired accuracy and shift the decimal point afterwards²!
Floats are not accurate with decimal fractions because the computer "has only two fingers".
Just try to express 1/3 accurately in decimal system!
And now imagine you're an alien with 3 fingers 4 and you have only computers that calculate in decimal fractions¹... wouldn't this annoy you, too?
Humans have too many fingers! Downsizing³
to octal system would do it...
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