Question $11,$ Problem $4-35$

HW Score: $83\mathrm{.}33\%,10$ of $12$ points

Points: $0$ of $1$

You graduate and receive a $$9,000$ cheque from your grandparents. You decide to save it toward a down payment on a house. You invest it earning $7\%$ per year, and you think you will need to have $$18,000$ saved for the down payment. How long will it be before the $$9,000$ has grown to $$18,000?$

To double the money you received from your grandparents, it will take years. $($Round to one decimal place.$)$