The coupon which gives Hideki a better deal is Coupon 2: as the total cost is: $27
The total cost of coupon 1 will be; $28.8
The total cost of coupon 2 will be; $27
For Coupon 1; Buy 1 get one 40% off.
Total cost = $18 + 60% ($18)
Total cost = $18 + $10.8.
Total cost = $28.8
For Coupon 2; 25% off entire purchase
Total cost = 75% ($18 + $18)
Total cost = 75% ($36)
Total cost = $27
:D Your Welcome!