Solving

for

n)

Jack asked Jill to marry him, and she has accepted under one condition: Jack must buy her a new

$320,000

Rolls-Royce Phantom. Jack currently has

$45,900

that he may invest. He has found a mutual fund with an expected annual return of

7.9%

in which he will place the money. How long will it take Jack to win Jill's hand in marriage? Ignore taxes.