B. From part A, we know that he pays 75% of the original price so the first box needs to be filled in with 75. Since he also takes off $10 using the coupon, then 10 needs to go in the second box to represent the price after the coupon. Therefore:
75%⋅ Original Price −10=61.25
C. The price of $61.25 was the price after both discounts. Since the $10-off coupon was applied last, then the price without the $10-off coupon is the final price of $61.25 plus $10. Therefore:
The price would then be $71.25 without a $10-off coupon.