You can choose to invest into a risky portfolio with an expected return of 20% and a standard deviation of 25%. The T-bill rate is 5% In your portfolio, you invest 20%, 30% and 50% in stock A, B and C, respectively The total money you want to invest is $10,000 . You want to have a complete portfolio with an expected return of 12% (1) how much you need to invest into the risky portfolio? (2) how much you need to invest into stock A, B and C? (3) What's the standard deviation of your complete portfolio