Porter Plumbing's stock had a requlred return of 11.50% last year, when the risk-free rate was 5.50% and the market risk premium was 4.75%. Then an increase in investor risk aversion caused the market risk premium to rise by 29 . 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.) Select the correct answer. 3. 14.03% b. 13.63% C. 13.83% d. 14.23% e. 14,43%