Equity: $35\%$ and cost of $14\mathrm{.}00\%$

Preferred stock: $15\%$ and cost of $11\mathrm{.}00\%$

Debt: $50\%$ and cost of $10\mathrm{.}0\%$ before taxes

What is the adjusted WACC for Lewis if the tax rate is

a$.40\%?$

b$.30\%?$

c$.20\%?$

d$.10\%?$

e$.0\%?$