Current Attempt in ProgressA recent leveraged buyout was financed with $$50$M: $$12$M in equity capital, $$20$M in unsecured debt borrowed at $7$ percent from one bank, and the remaining debt from another bank at $8\mathrm{.}5$ percent. What is the overall after$-$tax cost of the debt if the firm's marginal tax rate is $33$ percent?$7\mathrm{.}71\%2\mathrm{.}55\%5\mathrm{.}17\%3\mathrm{.}34\%$