An investor can design a risky portfolio based on two stocks, A and B. Stock A has an 17) expected return of 21% and a standard deviation of return of 39%. Stock B has an expected return of 14% and a standard deviation of return of 20%. The correlation coefficient between the returns of A and B is .4. The risk-free rate of return is 5%. The proportion of the optimal risky portfolio that should be invested in stock B is ?????????approximately ________. Please show all work