Rounding is a business rule: what your fee calculation actually charges

<p>A fee calculator is mostly arithmetic, and the arithmetic is mostly correct. The part that produces support tickets is the last step: rounding. It looks like formatting. It is actually a business rule that decides whether the number on screen matches the number that was charged, and in a fee-heavy product those two disagree more often than anyone expects.</p> <p>Here is what rounding actually d

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