Q2: You own a portfolio that has $700 invested in Stock A and $2,400 invested in Stock B. If the expected returns on these stocks are 11 percent and 18 percent, respectively. Required: a) What is the expected return on the portfolio? (1 mark) b) Why is some risk diversifiable? Why are some risks non-diversifiable? Does it follow that an investor can control the level of unsystematic risk in a portfolio, but not the level of systematic risk? (2 mark) c) Can the risk of a portfolio be reduced to zero by increasing the number of stocks in the portfolio? Explain. (1 mark) d) If investors' aversion to risk increased, would the risk premium on a high-beta stock increase by more or less than that on a low-beta stock? Explain (2 marks)