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sorry should have said this is the answer: P × 150) + [(1–p) × -80]
If EV falls to zero:
(P × 150) + [(1–p) × -80] = 0
150P -80 + 80P = 0
230P – 80 = 0
230P = 80
P = 0.3478 = 35%
however i am unsure on this formula as never seen this before so I do not understand the logic behind the workings
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