Assume that you manage a risky portfolio with an expected rate of return of 17% and a standard deviation of 35%. The T-bill rate is 4.5%. 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 25%. What is the investment proportion, y? (Do not round intermediate calculations. Enter your answer as a decimal rounded to four decimal places.) proportion, y