Problem 5-13 Assume that you manage a risky portfolio with an expected rate of return of 15% and a standard deviation of 40%. The T-bill rate is 5% Your risky portfolio includes the following investments in the given proportions: Stock A Stock B Stock Your client decides to invest in your risky portfolio a proportion of his total investment budget with the remainder in a T-bil money market fund so that his overall portfolio will have an expected rate of return of 13% a. What is the proportion y? (Round your answer to 1 decimal places.) Proportion y b. What are your client's investment proportions in your three stocks and in T-bilis? (Round your intermediate calculations and final