Consider an economy with only two risky assets X and Y and a risk-free bond. Suppose that the assumptions in the CAPM are satisfied in this economy. Suppose further that the total market value of asset X is equal to 25% of the total value of the risky assets in the economy. Let the expected excess return on the market portfolio be 10% and the standard deviations of return for assets X and Y be X = 15% and Y = 30%, respectively. The correlation between the return of assets X and asset Y is XY = 0.5. (a) What is the beta for each asset? (b) What is the expected excess return for each asset?