Based on current dividend yields and expected capital gains, the expected rates of return on portfolios A and B are 9.1% and 12.1%, respectively. The beta of A is .7, while that of B is 1.7. The T-bill rate is currently 5%, while the expected rate of return of the S&P 500 index is 10%. The standard deviation of portfolio A is 27% annually, while that of B is 48%, and that of the index is 37%. 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.) 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