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Problem 12-18 Portfolio Risk and Return (LO2) Suppose that the S\&P 500 , with a beta of 1.0, has an expected return of 13% and T-bills provide a risk-free return of 4%. a. What would be the expected return and beta of portfolios constructed from these two assets with weights in the S\&P 500 of (i) 0 : (ii) 0.25; (iii) 0.50; (iv) 0.75; (v) 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