Assume that you manage a risky portfolio with an expected rate of return of 12% and a standard deviation of 28%. The T-bill rate is 4%. Your risky portfolio includes the following investments in the given proportions: Stock A 20 % Stock B 30 % Stock C 50 % Your client decides to invest in your risky portfolio a proportion (y) of his total investment budget with the remainder in a T-bill money market fund so that his overall portfolio will have an expected rate of return of 11%. a. What is the proportion y? (Round your answer to 2 decimal places.) Proportion y b. What are your client's investment proportions in your three stocks and the T-bill fund? (Round your intermediate calculations and final answers to 2 decimal places.) Security Investment Proportions T-Bills % Stock A % Stock B % Stock C % c. What is the standard deviation of the rate of return on your client's portfolio? (Round your intermediate calculations and final answer to 2 decimal places.) Standard deviation % per year