T139

A1: 0
A2: 15000
A3: 25000
A4: 50000
A5: 100000
B1: 0
B2: 31.6
B3: 52.9
B4: 88
B5: 98.3
A: (A1, B1)
B: (A2, B2)
C: (A3, B3)
D: (A4, B4)
E: (A5, B5)
f = PolyLine({A, B, C, D, E})
g: y = 50
F = Intersect(g, f)