Stock R has a beta of 2.0 , Stock S has a beta of 0.50 , the required return on an average stock is 12.5%, and the risk-free rate of return is 11.00%. By how much does the required return on the riskier stock exceed the required return on the less risky stock? 2.25% 35.25% 2.25% 35.25% 18.75%