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MiniMax and Decision Tree Payoff Questions

For the attached problem, I need help with c, d, and e.

For a) I get Decision B
For b) I get Decision C

The answers for c, d, and e were shown in class to be as follows, but I need to see how they were obtained:

c) Decision A
d) EV(A)= 695 (best)
EV(B)= 385
EV(C)= 500
e) EVPI=230

Please show me how to compute the answers to c, d, and e.