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hmmm...does it matter that there is no way of telling if someone will be submitting values over three digits in length? the 90 and 11250 were just examples for this question but in actuality the chances that those exact numbers will be entered is slim.
as for not using $_POST[] would that not require register globals to be on? my understanding is that register globals is not something you really want on for security reasons.
EDIT: oh and btw the data that the calculations are being performed on are from a form.
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