Genco S.A's historical returns for the past three years are 7 percent, 13 percent, and 14 percent. Similarly, the market portfolio's returns were 14 percent, 9 percent, and 9 percent. Suppose the risk-free rate of return is 4 percent and that investors expect the market to return 9 percent. What is the cost of equity capital (required rate of return of company Genco S.A's common stock), computed with the CAPM? The answers is equal to -2.50 percent!