im going to make $240 from a teacher im doing some work for, im 16 and i dont really plan on using this money to buy anything but neither do i want it just sitting there, ive tried to think of ways to invest it but none i think is smart, im not looking to like turn it into $100,000 in 2 months by doing something reckless just want a smart way to invest it with a reasonable interest rate, any help?