A risky portfolio is made up of Stock A and Stock B. The optimal weights of Stock A and Stock B are 30% and 70%, respectively. Stock A has an expected rate of return of 12%, and Stock B has an expected rate of return of 9%. Treasury bills pay 4.20%. What proportion (weight) should be invested in the Treasury Bill to form a complete portfolio with an expected rate of return of 9.25% ? Multiple Choice 19% 11% 10% 8%