Suppose that the S&P 500, with a beta of 1.0, has an expected return of 12% 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 (1) 0; (ii) 0.25; (iii) 0.50; (iv) 0.75; (V) 1.0? (Leave no cells blank - be certain to enter "O" wherever required. Do not round intermediate calculations. Enter the value of Expected return as a percentage rounded to 2 decimal places and value of Beta rounded to 2 decimal places.) Beta (0) 0 Expected Return % % (ii) 0.25 (iii) % 0.50 0.75 (iv % 1.0 % b. How does expected return vary with beta? (Do not round intermediate calculations.) The expected return by % for a one unit increase in beta