Anne is a bargain-minded shopper. Normally, her favorite toothpaste costs the same at bo
Anne is a bargain-minded shopper. Normally, her favorite toothpaste costs the same at both of her local supermarkets, but the stores are having competing sales this week. At one store, there is a bonus offer: buy 2, get 1 free. At the other store, toothpaste is being sold at 40 percent off. Anne instantly opts for the first offer. Was that really the less-expensive choice? (Hint: Is “buy 2, get 1 free” the same as 50 percent off?)
3. The coffee shop near the local college normally sells 10 ounces of roasted coffee beans for $10. But the shop sometimes puts the beans on sale. During some sales, it offer “33 percent more for free”. Other weeks, it takes “33 percent off” the normal price. After reviewing the shop’s sales date, the shop’s manager finds that “33 percent more for free” sells a lot more coffee than “33 percent off.” Are the store’s customers making a systematic error? Which is actually the better deal?