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Answer:
3 shirts
Explanation:
The cost of one shirt is before discounts is $17.99
After a 20% discounts, the shirt will retail at
= $17.99 - (20% of $17.99)
=$17.99 -$3.598
=$14.392
The coupon applies purchases worth $40. A customer will need by
=$40/$14.392
=2.7793
The customer has to buy 3 shirts