Cassio, Inc. has equity with a market value of $20 million and debt with a market value of $10 million. Assume the firm has no default risk and can borrow at the risk-free interest rate. The risk-free interest rate is 5 percent per year, and the expected return on the market portfolio is 11 percent. The beta of the company's equity is 2. The tax rate is 20%. What is the cost of capital for an otherwise identical all-equity firm? 13.57% 15.98% 9.22% O 11.12%