Two blondes attending college rented a country cabin from a farmer for the summer. When they asked the farmer what he did with his garbage, he told them that he fed it to his pigs. So, they proceeded to buy a small porker for the reasonable price of $25.
Over the summer, they fed the porker their garbage, and the pig got big and fat.
When the summer ended, the two girls wanted to sell the pig before they went back to school. Since it had done its job well, they went to the farmer to see if he was interested.
"How much do you want for it?" the farmer asked.
One of the girls replied, "Well, we bought the pig new for $25 and now it's used -- so you can have it for $15."