You receive a

$4,000

check from your grandparents for graduation. 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

$8,000

saved for the down payment. How long will it be before the

$4,000

has grown to

$8,000

?

Part 1

To double the money you received from your grandparents, it will take

enter your response here

years.(Round to one decimal place.)