Unida Systems has 32 million shares outstanding trading for $ 12 per share. In addition, Unida has $ 117 million in outstanding debt. Suppose Unida's equity cost of capital is 12 %, its debt cost of capital is 9 %, and the corporate tax rate is 31 %.

a. What is Unida's unlevered cost of capital?

b. What is Unida's after-tax debt cost of capital?

c. What is Unida's weighted average cost of capital?