What are the probabilities of the different outcomes 1, 2, 3 and 4 from the event tree in Figure 1?

0.5 43 0.4 0.5 1 0.7 12 0.3 0.4 0.3 0.1 43 0.2 0.6 43 1 0.2 0.4 42 0.8 0.6 4 Figure 1: Event tree for Problem 2