Suppose a friend planning a shopping spree on the day after thanksgiving tells you he plans to buy a 65-inch plasma tv, and you say "there's no way you can afford that!" he then tells you that the store is offering 50% off any one item, and he has an Internet coupon good for 50% off any price, even a discounted one. So that's 100% off, and he'll get it for free! Explain why your friend will come home very Disappointed