Based on current dividend yields and expected capital gains, the expected rates of return on portfolios A and B are 12.7% and 16.1%, respectively. The beta of A is .8, while that of B is 1.5. The T-bill rate is currently 7%, while the expected rate of return of the S\&P 500 index is 14%. The standard deviation of portfolio A is 25% annually, while that of B is 46%, and that of the index is 35%. Think about what are the appropriate performance measures to use in question a and b. and why, a. If you currently hold a market index portfolio, what would be the alpha for Portfolios A and B ? (Negative vale should be indicated by a minus sign. Do not round intermediate calculations. Enter your answer as a percentage rounded to 1 decimal place.)