You have $15,000 to invest in a stock portfolio. Your choices are Stock X with an expected return of 15 percent and Stock Y with an expected return of 8 percent. Required: (a) If your goal is to create a portfolio with an expected return of 12.1 percent, how much money will you invest in Stock X? (b) If your goal is to create a portfolio with an expected return of 12.1 percent, how much money will you invest in Stock Y?