You invest $10,000 in a portfolio composed of a risky asset with an expected rate of

return of 15% and a standard deviation of 20% and risk-free Treasury bills (Tbills)

with a rate of return of 5%. How much money should be invested in the Treasury bill

to form a portfolio with an expected return of 20% and what kind of a position is it?

Should not invest in the Tbills because they pay low return

$15,000, long position in Tbills

$5,000, long position in Tbills

$10,000, short position in Tbills

$5,000, short position in Tbills