Jack asked Jill to marry him, and she has accepted under one condition: Jack must buy her a new $310000 Rolls-Royce Phantom. Jack currently has $41330 that he may invest. He has found a mutual fund with an expected annual return of 5 percent in which he will place the money. How long will it take Jack to win Jill's hand in marriage? Ignore taxes and inflation. Round to one decimal place.