OK fine - but why are you taxing USPS? Is that done in Texas?
That (I believe) is the problem - in other words, your ZC is working fine, your math should not include a tax on USPS.
Discount process $81.96 - $16.39 = $65.57
Tax Process $65.57 * .0825 = $5.41 Tax amount on item after discount.
$65.57 + $5.41 = $70.98 Total Including Tax
$70.98 + $7.35 = $78.33 total including taxed item with USPS added separately.
This is (I believe) the correct answer $78.33
Respectfully,
jund (John Underwood)
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