You're trying to save to buy a new $$170,000$ Ferrari. You have $$40,000$ today that can be invested at your bank. The bank pays $3\mathrm{.}5$ percent annual interest on its accounts. How long will it be before you have enough to buy the car?

Multiple Choice

$42\mathrm{.}06$ years

$40\mathrm{.}06$ years

$42\mathrm{.}56$ years

$41\mathrm{.}81$ years

$42\mathrm{.}31$ years