I am having trouble as can someone help me solve this?

There are 4 scenarios of the market. An asset returns -5% in scenario 1, 10% in scenario 2, -15% in scenario 3 and 20% in scenario 4. The probabilities of scenario 1-4 are 15%, 20%, 30% and 35% respectively. What is the return of the stock? What is the variance of the stock