Tom walked into a shop. It had a sign outside:" Second-hand clothes bought and sold. " He was carrying an old pair of trousers and asked the owner of the shop." How much will you give me for these?" The man looked at them and then said, "Two dollars ." "What!" said Tom. "I had guessed they were worth(...) at least five." "No," said the man, "they aren't worth a cent more than two dollars." "Well," said Tom. Taking two dollars out of his pocket, "Here's your money. These trousers were hanging outside your shop. The list price of them was six dollars and a half. But I thought that was too much money, so I wanted to find out how much they were really worth. " Before the shop owner could think of anything, Tom walked out of the shop with the pair of trousers. From the story we know that   _   cheaper than the list price.
the owner sold the trousers two dollars Tom sold the trousers one dollar and a half the owner bought the trousers three dollars Tom bought the trousers four dollars and a half