You invest $10,000 in a complete portfolio. The complete portfolio is composed of a risky asset with an expected rate of return of 15% and a standard deviation of 21% and a Treasury bill with a rate of return of 5%. How much money should be invested in the risky asset to form a portfolio with an expected return of 11%?
A. $6,000
B. $4,000
C. $7,000
D. $3,000
Answer: A. $6,000
15y + 5(1 - y) = 11; y = 60%; .60(10,000) = $6,000