Suppose that you have the following information: a. Calculate the covariance between each pair of stock. b. Calculate the expected return and risk of the portfolio with 50% investment in VCB and 50% in VIC. c. Calculate the expected return and risk of the portfolio with 50% investment in VCB and 50% in FPT. d. Calculate the expected return and risk of the portfolio with 30% investment in VCB, 40% in VIC and 30% in FPT