An all equity firm has a cost of capital of 16 percent. The firm is considering switching to a debt-equity ratio of .65 with a pretax cost of debt of 7.5 percent. What will the firm's cost of equity be if the firm makes the switch? Ignore taxes.
A.18.25%
B.21.53%
C.20.42%
D.19.88%
E.22.46%