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 10.7 percent, how much money will you invest in Stock X?

(b)

If your goal is to create a portfolio with an expected return of 10.7 percent, how much money will you invest in Stock Y?

I don't understand how you calculate to find the portfolio