4) The risks and returns of A and B shares are given below. Calculate the risk and returns of the portfolios that are formed if the portfolio is created from the two shares with different weights. Stock Expected return A B %20 %16 St. Var. %30 %24 Corr.Coefficient 0.5 Port.1 %80 %20 P2 %50 P3 %30 %50 %70