4. You are considering investing $1,000 in a complete portfolio. The complete portfolio is composed of T-bills that have 3% return, and a risky portfolio P constructed with three risky securities X, Y and Z. The optimal weights of X, Y and Z in Pare 20%, 50% and 30%, respectively. X, Y and Z have an expected return of 12%, 8% and 10%, respectively. What are the dollar values of your investment in each of X, Y, Z and T-bills if you decide to hold a complete portfolio that has an expected return of 7%? Show your calculations