need video or explanation for step c

Portfolio risk and return Mark Harrywitz proposes to invest in two shares, X and Y. He expects a return of 12% from X and 8% from Y. The standard deviation of returns is 8% for X and 5% for Y. The correlation coefficient between the returns is 2. a. Compute the expected return and standard deviation of the following portfolios: Portfolio Percentage in X Percentage in Y 1 2 3 50 25 75 50 75 25 b. Sketch the set of portfolios composed of X and Y. C. Suppose that Mr. Harrywitz can also borrow or lend at an interest rate of 5%. Show on your sketch how this alters his opportunities. Given that he can borrow or lend, what proportions of the common stock portfolio should be invested in X and Y? Step-by-step solution