If there is 15% off, this implies, she is paying ; (100% - 15%) $25
= 85% ($25)
= (85/100) $25
= $21.25
She have a coupon for 25% , then this implies she will pay (100% - 25%) $21.25
= 75% of $21.25
= (75/100 ) x 21.25
= $15.9375
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