Riddle: A person walks into a hardware store looking for a certain item. He asks the cashier how much the item is and the clerk says "25 cents each." The customer says, "good, i will take 100." To which the cashier says, "your total is 75 cents." How is this possible? No packages of more than one item were purchased.
Answer: It is possible!!! The customer is buying house numbers and since there are 3 letters in 100 this would cost 75 cents. No you cannot say that he is buying groups of something because 100 is not evenly divisible by three, making 75 cents an impossible total to acheieve in this way.