Economics 20th Edition by Campbell McConnell ,Stanley Brue ,Sean Flynn

تمرين 3

The coffee shop near the college normally sells 10 ounces of roasted coffee beans for $10. But the shop sometimes puts the beans on sale. During some sales, it offers "33 percent more for free." Other weeks, it takes "33 percent off" the normal price. After reviewing the shop's sales data, the shop's manager finds that "33 percent more for free" sells a more coffee than "33 percent off." Are the store's customers making a systematic error? Which is actually the better deal?