You are considering investing $1,000 in a complete portfolio. The complete portfolio is composed of Treasury bills that pay 5% and a risky portfolio. P. constructed with two risky securities. X and Y. The optimal weights of X and Y in P are 60% and 40%. respectively. X has an expected rate of return of 14%, and Y has an expected rate of return of 10%. To form a complete portfolio with an expected rate of return of 15%. you should invest of your complete portfolio in Treasury bills and it is a