Your uncle offers you a choice of $30,000 in 50 years or $95 today. If money is discounted at 12 percent, which should you choose?

If you invest $2,000 a year in a retirement account, how much will you have:
a. In 5 years at 6 percent?
b. In 20 years at 10 percent?
c. In 40 years at 12 percent?