Find the duration of a $7\mathrm{.}0\%$ coupon bond making semiannually coupon payments if it has three years until maturity and has a yield to maturity of $7\mathrm{.}0\%.$ What is the duration if the yield to maturity is $8\mathrm{.}4\%?$Note: The face value of the bond is $$1,000.$ Do not round intermediate calculations. Round your answers to $2$ decimal places.