Part A: if the price is $65 and if 40% is off so Li should pay 60% of it. So 60% of $65 is: 60/100 = ?/65 ? is the sale price: 65*60/100 = $39 Part B: if he has 10% coupon for off then he should pay 90% of $39: 90/100 = ?/39 so ? is the answer: 39*90/100 = $35.1 :))) I hope this is helpful have a nice day