In a board game, players take turns spinning a wheel with 4 spaces and values of $20, $60, $80, and $120. The probability of landing on $20 is 4/9. The probability of landing on $60 is 2/9. The probability of landing on $80 is 2/9. The probability of landing on $120 is 1/9. What is the expected value of spinning the wheel once?