First apply 20% discount then applied $15 coupon combination gives better deal.
As given in the question,
Let final cost of the shoes be $100
First apply $15 coupon then applied 20% discount
100-15=$85
Now, 20% of 85= (20/100) × 85
=$17
Final price, 85 - 17 =$68
First apply 20% discount then applied $15 coupon
Now, 20% of 100= (20/100) × 100
=$20
100-20 = $80
Apply coupon $15
Final price, 80 - 15 =$65
Therefore, first apply 20% discount then applied $15 coupon combination gives better deal.
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