THIS IS A BONUS PROBLEM: Larry bought a car for $$40,000$ at $"0\%"$ interest for $60$ months

$($ $$40,000$ in total was paid in $60$ equal monthly payments$).$ The financing was done through

Flames Financing Co$.$ If he had paid cash for the car in the beginning, he would have paid

$$34,000.$ Determine the annual interest rate he is paying on this car loan.

$6\mathrm{.}6\%$

$6\%$

$5\mathrm{.}2\%$

$5\mathrm{.}8\%$