The risk-free rate is 4%, the market risk premium is 6%, and the market return is 10%. Stock A's beta is 2.1, and the standard deviation of its return is 62.5%. What should be the stock's expected rate of return to make the investor indifferent toward buying or selling the stock? (Round answer to two decimal places.) a. 16.60% b. 20.54% c. 22.50% d. 18.82%