Answer:
EV(1) = max(46.8, 44.4, 53.6) = 53.6m
Explanation:
Diagram is shown in the attached file
EV(5) =max(42, 48) = 48m
EV(6) =max(46, 50) = 50m
EV(2) =0.20(42) + 0.80(48) = 46.8m
EV(3) =0.20(22) + 0.80(50) = 44.4m
EV(4) =0.20(-20) + 0.80(72) = 53.6m
EV(1) =max(46.8, 44.4, 53.6) = 53.6m