Suppose that the S\&P 500 , with a beta of 1.0 , has an expected return of 15% and T-bills provide a risk-free return of 6%. 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 ; (2) 0.25 ; (3) 0.50 ; (4) 0.75; (5) 1.0 ? Note: Leave no cells blank - be certain to enter " 0 " 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. b. How does the expected return vary with beta? Note: Do not round intermediate calculations