Susan Norman seeks your financial advice. She wants to know how long it will take for her to become a millionaire. She tells you that she has $1,330 today and wants to invest it in an aggressive stock portfolio. The historical return on this type of investment is 18% per year. How long will she have to wait if the $1,330 is the only amount she invests and she never withdraws from the market until she reaches her $1 million? (Assume no taxes on the earnings). What if the rate of return is only 14% annually? What if the rate of return is only 10% annually?