Hello $-$ can someone please help me with this?

$($Solving for n$)$Jack asked Jill to marry$$ him, and she has accepted under one$$ condition: Jack must buy her a new $$$$300,000$Rolls$-$Royce Phantom. Jack currently has $$$$38,600$ that he may invest. He has found a mutual fund with an expected annual return of $5\mathrm{.}5$ percent in which he will place the money. How long will it ta

The number of years it will take for Jack to win$$ Jill's hand in marriage is how many years?$-$ rounded to one decimal place