10. How many months will you have to invest $500 in order to have $4 million in a retirement account if you can earn an interest rate of 12%? (Assume you do not have any money in the retirement account currently)

11. Suppose you are 28 yrs old and are looking to start a retirement account. You desire to have $6 million in your account when you retire at age 65. You feel that you can afford to invest monthly payments of $700. What rate of return (in percent) will you need to get to meet your savings goal?