A man wanted to buy a piece of machinery. The salesman told him that the price was $400, but if he paid cash he would give him 6% off that price. Well, the man was not too swift with mathematics. He couldn't quickly figure out the savings. So he told the salesman that he would think about it and come back tomorrow.
He was still thinking about it that evening when he was out with his girl. So he asked her, "If I gave you 400 dollars with a six percent discount, how much would you take off?
She thought for a minute and said, "Everything but my earrings."