An investor can design a risky portfolio based on two stocks, A and B. Stock A has an expected return of 12% and a standard deviation of return of 28%. Stock B has an expected return of 9% and a standard deviation of return of 13%. The correlation coefficient between the returns of A and B is .5. The risk-free rate of return is 5%. The proportion of the optimal risky portfolio that should be invested in stock B is approximately _________.
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