$($Estimated time allowance: $6$ minutes$)$ A company currently has two outstanding bond issues: Series$-$A is a $30-$year bond selling at $$1,100$ each bond and has a current YTM of $10\%.$ Series$-$B is a $10-$year bond selling at $$900$ each bond and has a current YTM of $6\%.$ There are $10$ Series$-$A bonds outstanding and $50$ Series$-$B bonds outstanding. The tax rate is $30\%.$ Click here for a formatted shell excel file

What is the weighted average cost of debt for the company?

For your answer, round to the nearest $.1\%.$ Do not use the $\%$ sign in your answer. For example, if the answer is $9\mathrm{.}23\%,$ enter your answer as $9\mathrm{.}2$ ; Do not enter it as $\mathrm{.}0923,0\mathrm{.}0923,$ or $9\mathrm{.}23\%.$

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