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You manage a risky portfolio with an expected rate of refum of 18% and a standand deviation of 28. The T.bill fate is 8.6. Your risky portfotio includes the following irwestments in the given proportions: will have an expected rate of returm of 16%. a. What is the proportion y ? (Round your answer to the nearest whole numbec.) b. What are your client's investment proportions in your three stocks and the T-bill fund? (Round your answers to 1 decimal place.) c. What is the standard deviation of the fate of return on your client's portfolio? (Round your answer to 1 decimal place.)