Answer question 4 please, the other two images help answer it.

4. (20 points) Suppose, in the previous exercise, you want to choose the weights optimally to get a 12% expected return. What are all the steps you have to carry out in order to perform this? Describe these steps and set the inputs, outputs and constraints you will need/obtain. You want to optimize a portfolio composed of 3 assets. These are assets A, B and C. The expected returns are 5%, 10% and 15%, respectively. The standard deviations are 7%, 10%, and 20%. a. What is the expected return if you invest 35%, 25%, and 40% in assets A. B. and C? b. What is the standard deviation of the portfolio from the previous point if all the covariances are zero? c. What is the standard deviation of the portfolio from the previous point if you know all the correlations are zero but the one between assets A and B, which is 0.9? Note you have the correlation not the covariance. a) Return of portfolio = {Wx* Rx = 5* 0.35 +10 * 0.25 +15 * 0.40 = 10.25% b) Risk of portfolio (Given that corelation coefficent is 0) = V[(SDa * Way2 + (SDb * Wb)2 + (SDc *Wc = V[(7* 0.35)2 + (10 * 0.25)2 + (20 * 0.40)21 = 8.73% b) Risk of portfolio (Given that corelation coefficent between is A & B is 0.9) = V[(SDa* Wal2 + (SDb * Wb)2 + (SDc* Wc)2+2 * SDa * SDb *Wa* Wb * Rab] = V[(7* 0.35)2 + (10 * 0.25)2 + (20 * 0.40)2 +2*7*10* 0.35 * 0.25 * 0.9] + + = 9.34% 4. (20 points) Suppose, in the previous exercise, you want to choose the weights optimally to get a 12% expected return. What are all the steps you have to carry out in order to perform this? Describe these steps and set the inputs, outputs and constraints you will need/obtain. You want to optimize a portfolio composed of 3 assets. These are assets A, B and C. The expected returns are 5%, 10% and 15%, respectively. The standard deviations are 7%, 10%, and 20%. a. What is the expected return if you invest 35%, 25%, and 40% in assets A. B. and C? b. What is the standard deviation of the portfolio from the previous point if all the covariances are zero? c. What is the standard deviation of the portfolio from the previous point if you know all the correlations are zero but the one between assets A and B, which is 0.9? Note you have the correlation not the covariance. a) Return of portfolio = {Wx* Rx = 5* 0.35 +10 * 0.25 +15 * 0.40 = 10.25% b) Risk of portfolio (Given that corelation coefficent is 0) = V[(SDa * Way2 + (SDb * Wb)2 + (SDc *Wc = V[(7* 0.35)2 + (10 * 0.25)2 + (20 * 0.40)21 = 8.73% b) Risk of portfolio (Given that corelation coefficent between is A & B is 0.9) = V[(SDa* Wal2 + (SDb * Wb)2 + (SDc* Wc)2+2 * SDa * SDb *Wa* Wb * Rab] = V[(7* 0.35)2 + (10 * 0.25)2 + (20 * 0.40)2 +2*7*10* 0.35 * 0.25 * 0.9] + + = 9.34%