p(x) = 8.4 - (8.4 - 2.75)/141.25·x = 8.4 - 0.04·x
E(x) = (8.4 - 0.04·x)·x = 8.4·x - 0.04·x^2
G(x) = E(x) - K(x) = (8.4·x - 0.04·x^2) - (0.0019·x^3 + 0.106·x^2 + 3·x + 26) = - 0.0019·x^3 - 0.146·x^2 + 5.4·x - 26
G'(x) = - 0.0057·x^2 - 0.292·x + 5.4 = 0 --> x = 14.43
14.43 / 17 = 0.8488 Mbbl Öl pro Plattform maximieren den Gewinn.