Based on current dividend yields and expected capital gains, the expected rates of return on portfolios A and B are 11.5% and 13.1%, respectively. The beta of A is .8, while that of B is 1.4. The T-bill rate is currently 6%, while the expected rate of return of the S&P 500 index is 12%. The standard deviation of portfolio A is 18% annually, while that of B is 39%, and that of the index is 28%. a. If you currently hold a market index portfolio, what would be the alpha for Portfolios A and B? (Negative value should be indicated by a minus sign. Do not round intermediate calculations. Round your answers to 1 decimal place.) Alpha Portfolio A % Portfolio B % b-1. If instead you could invest only in bills and one of these portfolios, calculate the sharpe measure for Portfolios A and B. (Round your answers to 2 decimal places.) Sharpe Measure Portfolio A Portfolio B b-2. Which portfolio would you choose? Portfolio A Portfolio B