Waiting period. 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 $$$$1$ comma $330$ today and wants to invest it in an aggressive stock portfolio. The historical return on this type of investment is $18\%$ per year. How long will she have to wait if the $$$$1$ comma $330$ is the only amount she invests and she never withdraws from the market until she reaches her$$ $$1$ million? $($Assume no taxes on the$$ earnings.$)$ What if the rate of return is only $14\%$annually$?$ What if the rate of return is only $10\%$annually$?$

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Part $1$

How long will Susan have to wait to become a millionaire if she invests $$$$1$ comma $330$ today at an annual rate of return of $18\%?$

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enter your response here years $($Round to two decimal$$ places.$)$

Part $2$

How long will Susan have to wait to become a millionaire if she invests $$$$1$ comma $330$ today at an annual rate of return of $14\%?$

$$

enter your response here years$($Round to two decimal$$ places.$)$

Part $3$

How long will Susan have to wait to become a millionaire if she invests $$$$1$ comma $330$ today at an annual rate of return of $10\%?$