You are analyzing the cost of debt for a firm. You know that the firm's $14-$year maturity, $8\mathrm{.}6$ percent coupon bonds are selling at a price of $$832\mathrm{.}00.$ The bonds pay interest semiannually. If these bonds are the only debt outstanding, answer the following questions.

What is the after tax cost for this firm if it is subject to $30$ percent marginal and average tax rates $?$