5. Aftertax cost of debt (LO11-3 Car ) Calculate the aftertax cost of debt under each of the following conditions: \begin{tabular}{lcc} \hline & Yield & Corporate Tax Rate \\ a. & 8.0% & 18% \\ b. & 12.0 & 34 \\ c. & 10.6 & 15 \\ \hline \end{tabular}