You receive a $6,000 check from your grandparents for graduation. You decide to save it toward a down payment on a house. You invest it earning 12% per year and you think you will need to have $12,000 saved for the down payment. How long will it be before the $6,000 has grown to $12,000?

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