Mikkelson Corporation's stock had a required return of 12.50% last year, when the risk-free rate was 3% and the market risk premium was 4.75%. Then an increase in investor risk aversion caused the market risk premium to rise by 2%. The risk-free rate and the firm's beta remain unchanged. What is the company's new required rate of return? (Hint: First calculate the beta, then find the required return.) Do not round your intermediate calculations. a. 13.04% b. 12.87% c. 16.50% Od. 14.36% Oe. 12.71%