7. You have $500,000 available to invest. The risk-free rate, as well as your borrowing rate, is 8%. The return on the risky portfolio is 16%. The standard deviation on the risky portfolio is 50%.

a. If you wish to earn a 22% return, how much money should you borrow?

b. If the standard deviation on the complete portfolio is 25%, what is the expected return on the complete portfolio?