Can you do math? It’s a yes-or-no question. Give me the courtesy of a straight answer to my simple question.
Try this then. There were three people who checked into a hotel room that cost thirty dollars a night. Each one paid ten dollars. The clerk later figured out he had made a mistake and that it was a twenty-five-dollar room. He sent a bellboy up with five dollars in ones. The bellboy gave each of them a dollar back and kept two dollars as a tip. Each had originally paid ten dollars, and now with one back they had each paid nine dollars for the room. Three times nine is twenty-seven. That leaves three dollars from the original thirty. The bellboy kept two. How do you account mathematically for the missing dollar?
I don’t know.
If that’s how you do bookkeeping, they’d rob you blind.
[from Immortal for Quite Some Time]