10. Calculate the expected return and variance of portfolios invested in T-bills and the S&P 500 index with weights as follows: Wolls Windex 0 1,0 0.2 0.8 0.4 0.6 0.6 0.4 0.8 0.2 1.0 0 11. Calculate the utility levels of each portfolio of Problem 10 for an investor with A = 2. What do you conclude? Expected return % 13 11.4 9,8 8.2 616 5 Variance % 4 2,56 1.44 164 16