When I use the coupon and tax together, their computation don't match my goal. Tax is affected by the coupon. Say,
$80 is the orig price
10% is the coupon
So $72 is the sub total.
Then comes tax of %5
Problem here is it will tax the $72 subtotal not the $80 orig price.
How can I make it compute the $80 instead of the $72?
Thanks in advanced!