Finance Help: Manuel Rios wishes to determine how long it will take an initial deposit of ​$9000

Time to accumulate a given sum Personal Finance Problem   Manuel Rios wishes to determine how long it will take an initial deposit of ​$9000 to double.
a.  If Manuel earns 9​% annual interest on the​ deposit, how long will it take for him to double his​ money?
b.  How long will it take if he earns only 6​% annual​ interest?  
c.  How long will it take if he can earn 11​% annual​ interest?
d. Reviewing your findings in parts a​, b​, and c​, indicate what relationship exists between the interest rate and the amount of time it will take Manuel to double his money.

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