You are valuing a private firm and need to estimate its total cost of capital. Assume the firm's cost of borrowing is 7 percent, its cost of equity is 13 percent, its tax rate is 35 percent, and the proportions of debt and equity financ- ing are 40 percent and 60 percent, respectively.

 Required 

Calculate the firm's total cost of capital. Next, calculate the firm's total cost of capital assuming the proportions of debt and equity financing are 70 percent and 30 percent, respectively.