Please how how you got the answer.

__________ of your complete portfolio should be invested in the risky portfolio if you want your complete portfolio to have a standard deviation of 9%. A. 100% B. 90% C. 45% D. 10%

A portfolio that has an expected value in one year of $1,100 could be formed if you _________. A. Place 40% of your money in the risky portfolio and the rest in the risk free asset B. Place 55% of your money in the risky portfolio and the rest in the risk free asset C. Place 60% of your money in the risky portfolio and the rest in the risk free asset D. Place 75% of your money in the risky portfolio and the rest in the risk free asset