Susan Norman seeks your financial advice. She wants to know how long it will take her to become a millionaire. She tells you that she has $$$$1$ comma $662$ today and wants to invest it in an aggressive stock portfolio. The historical return on this type of investment is $19\%$ per year. How long will she have to wait if the $$$$1$ comma $662$ is the only amount she invests and she never withdraws from the market until she reaches her$$ $$1$ million? $($Assume no taxes on the$$ earnings.$)$ What if the rate of return is only $13\%$annually$?$ What if the rate of return is only $9\%$annually$?$