You are analyzing the cost of debt for a firm. You know that the firm's $14-$year maturity, $7\mathrm{.}8$ percent coupon bonds are selling at a price of $$834,00.$ The bonds pay interest semiannually, If these bonds are the only debt outstanding. answer the following questions. Problem $13\mathrm{.}17$a$1-$a$2($a$1)$ What is the current YTM of the bonds? $($Round intermediate calculations to $4$ decimal places, eg$.1\mathrm{.}2514$ and final answer to $0$ decimal ploces, eg$.15\backslash \%(1)$ What is the current YTM of the bonds? What is the after$-$tax cost of debt for this firm if it is subject to $30$ precent marginal and average tax rates