What is the expected return on a stock if the firm will earn 24% during a period of economic boom, 14% during normal economic periods, and 2% during a period of recession if the probabilities of these...

What is the expected return on a stock if the firm will earn 24% during a period of economic boom, 14% during normal economic periods, and 2% during a period of recession if the probabilities of these economic environment are 20%, 65% and 15%, respectively?