A = (10, 350)
B = (12, 130)
C = (13, 170)
D = (14, 270)
E = (16, 530)
F = (18, 670)
G = (19, 620)
H = (20, 450)
I = (17, 630)
f = Function(-5 * x^(3) + 225 * x^(2) - 3240 * x + 15250, 10, 20)