Calculate the required rate of return for Mercury Inc., assuming that investors expect a 2.8 percent rate of inflation in the future. The real risk-free rate is equal to 3.2 percent and the market risk premium is 4 percent. Mercury has a beta of 1.8, and its realized rate of return has averaged 13 percent over the last 5 years. 13.70% 14.20% 13.20% O 12.70% 14.70%