A portfolio is invested 50 percent in Stock A; 30 percent in Stock B; and 20 percent in one bond. The bond has an expected return of 7.25 percent and Stock B has expected return of 12 percent. What is the expected rate of return of Stock A if the portfolio's expected return is 10.80 percent?

	A.	12.5 percent
	B.	11.5 percent
	C.	9.5 percent
	D.	10.5 percent