You are analyzing the cost of debt for a firm. You know that the firms $14-$year maturity, $6\mathrm{.}6\%$ coupon bonds are selling at a price of $$842\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 of debt for this firm if it is subject to $30\%$ marginal and average tax rates?