A Company Has a Tax Rate of 40

Short Answer

A company has a tax rate of 40%.Leverage would be beneficial for the company for each of the following combinations of interest rates and ROA except:
$$\begin{array} { | l | c | c | } \hline & \begin{array} { c } \text { Interest } \\\text { rate }\end{array} & \text { ROA } \\\hline \text { a. } & 4 \% & \mathbf { 6 \% } \\\hline \text { b. } & \mathbf { 6 \% } & \mathbf { 6 } \% \\\hline \text { c. } & 14 \% & 10 \% \\\hline \text { d. } & 16 \% & 10 \% \\\hline\end{array}$$