13. A portfolio has an expected return of 12.3 percent. This portfolio contains two stocks and one risk-free security. The expected return on stock X is 9.7 percent and on stock Y it is 17.7 percent. The risk-free rate is 3.8 percent. The portfolio value is $78,000 of which $18,000 is the risk-free security. How much is invested in stock X? A) $18,600 B) $19,667 C) $21,375 D) $22,204 E) $24,800