Problem 12-15 Portfolio Risk and Return (LO2) Suppose that the S&P 500, with a beta of 1.0, has an expected return of 16% and T-bills provide a risk-free return of 3%. a. What would be the expected return and beta of portfolios constructed from these two assets with weights in the S&P 500 of (0) 0; (ii) 25; (ii) 50: (iv)75; (v) 1.0? (Leave no cells blank - be certain to enter "O" wherever required. Do not round intermediate calculations. Round your answers to 2 decimal places.) Expected return Beta (i) 25 (ii) .50 (iv) 75 b. How does expected return vary with beta? (Do not round intermediate calculations.) The expected return (Click to sele by % for a one unit increase in beta