Our business model is based on the region of Wroclaw (I have heard that there is some big manufactures there). So you think the salary level there for a worker is higher than 13zl/hour? What is a normal work time?
Normal work is 40 hours a week.
Yes, production line workers will expect more near Wrocław because it's very difficult to find good workers there. The cost of living is comparatively high in Wrocław - so to give an idea, Amazon are offering 13zl/h AND taking people in by free bus from towns/villages up to 60km away. I'd expect to have to pay in the region of 15zl/hour just to find good, reliable people. Although - if the job is physically undemanding, then you could offer less as it means that older people can work there.