How do you calculate the expected return of a single asset and a portfolio of assets? What factor is taken into account while computing the returns from an international investment? If expected return...

How do you calculate the expected return of a single asset and a portfolio of assets? What factor is taken into account while computing the returns from an international investment?

If expected return from X, Y and Z is respectively 10.2%, 12% and 11% and investment in them is in the ratio of 40:40:20, find the portfolio return.