answer each part part step by step clearly

4. (10 POINTS)The following 3 assets are available to an investor: (1) Asset A: ErA=0.12,A=0.30 (2) Asset V:ErV=0.24V=.60 (3) Asset R:ErR=0.20R=.40 Also: rf=0.04. AV=0.20,AR=.4,VR=0.1 are the correlation coefficients between assets A and V,A and R and V and R respectively. The investor considers investing in one of the following port folios: P with wA=0.6 and wV=0.4 and Z : with wV=0.5 and wR=0.5. (a) Examine portfolio: P with wA=0.6 and wV=0.4. Calculate ErP,P (b) Examine portfolio: Z with wV=0.5 and wR=0.5. Calculate ErZ,Z (c) Which portfolio should the manager choose? Answer by calculating and comparing the Sharpe ratios for these 2 portfolios