SOLUTION: if i bought something for 128 before taxes and i had a 15 % coupon how much would be my total after taxes with the coupon included

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Question 823773: if i bought something for 128 before taxes and i had a 15 % coupon how much would be my total after taxes with the coupon included
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
Can't say, without knowing the tax rate. Assuming T% is tax rate, then, the discount is to require the purchase at 85% of the 128 money units.

Cost+=+%28128%29%280.85%29%2B%28128%29%2A%28T%2F100%29;

The tax is based on the original undiscounted purchase price.