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 9% 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.)