4. Answer the problem based on the framework of Modigliani and Miller Propositions. Assume that a company has earnings before interest and taxes (EBIT) of $20,000,000 every year forever. The firm also has perpetual bonds with the market value of $30,000,000. The before-tax cost of debt is 7 percent. The firm's unlevered cost of capital is 15 percent. The tax rate is 25 percent. a) Find the value of the levered firm (value of the firm with debt). b) Find the value of equity. c) Find the firm's cost of equity. d) Find the firm's weighted average cost of capital