K(x) = 50000 + (25 * x) + (0.0005 * x^(2)) + ((5 * 10^(-7)) * x^(3))
E(x) = (120 * x) - (0.02 * x^(2))
G(x) = E(x) - K(x)
a: G(2150)
G1(x) = G'(x)
A = Extremum(G1)
l1 = Solve(G1(x) = 0)
h(x) = (-0.0000005 * x^(3)) - (0.0205 * x^(2)) + (95 * x) - 50000
l2 = Sequence((i, G(i)), i, 800, 1500, 100)
gL: -200
gR: 4000
gU: -10000
gO: 60000