Assume that you manage a risky portfolio with an expected rate of return of 12% and a standard deviation of 47%. The T-bill rate is 4%. Stock A 31 % Stock B 31 % Stock C 38 % A client prefers to invest in your portfolio a proportion (y) that maximizes the expected return on the overall portfolio subject to the constraint that the overall portfolio's standard deviation will not exceed 35%. a. What is the investment proportion, y? (Do not round intermediate calculations