Phun Money

If I ever happened to be given 50 dollars, I would open an account to store my money online. I would do this, because after a while, the money would start to double when I start my job after college. This money could also start to double if I link the account to my parents credit card, so they can gain money. Also, they could gain money and give some of the money. Afterwards, I would use the money to start my own business. At last, I could gain my own money. Can you think of what to do with 50 dollars?