Communication Problem

Joined
Feb 14, 2017
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Andy went to a store to buy a shirt. The shirt he likes normally sells for $20 but it is on sale for 20% off. When Andy goes to pay for the shirt he is told he also has to pay a 7.5% sales tax on his purchase.

Would it be better for Andy if the 7.5% sales tax was calculated before the 20% discount was taken off or after the discount was taken off?

Explain your answer. Be sure to include your calculations and work fo the problem. Give as many details as you can so that I can understand your thinking.
 
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