500
You want a piar of pants that cost $97. You dont have the money so you borrow some from your parents. They each give you $50. (50+50=100). You buy the pants and get back three dollars. So you give your mom a dollar, your dad a dollar, and keep the extra one to yourself. 49+49=98+your dollar=$99. Where's the extra dollar?
What is IDK!?!?!?!?!?! :D