PART 1:

Your bank offers an interest rate of 4% per year.

How many years does it take to double your money?

PART 2:

You have $4,000 in your savings account, and want to buy a car for $25,000.

If you want to buy the car in 7 years, what interest rate would you need to earn?

PART 3:

You expect to receive two cash flows: $34,000 paid in 5 years and $51,000 paid in 10 years. You'll put the money into a savings account with an annual interest rate of 9%.

What is the future value of the combined cash flows, in 15 years?