It varies depending on where do you live.week tickets:Cracow( i'm from here ): 2D 15-24 zl (3,6-5,7 euros), 3D 21-29 zl (5,0-7 euros)Warsaw(capital): 2D 20-28 zl (4,8-6,7 euros), 3D 25-34 zl (6-8,2 euros)I think different comparision would be more accurate( because products aren't that expensive).Average month salary is around 793 euros, but mostly people earn 450-600 euros per month.