A fair notion of salaries in major Polish cities

I need to get a fair notion of salaries in major cities, and maybe someone can help. Since I came to Poland to interact with practically everyone I meet, I think I need to get a fair notion of salaries people have, because I don't want to propose to them activities that are beyond their means and therefore put them in a delicate situation, thinking the way salaries were in my home country, or my financial means are at the moment. I don't interact with people just from my trade or class (the latter term I learned how to use in Poland, as a matter of fact). So while I have a good grasp of prices, I don't have a good grasp of salaries, and I think it will help me better interact with people.

So thinking about a city like Kraków, what would the monthly net average salaries for, let's say:
- shop clerk
- cleaning lady
- courier
- highschool teacher
- flower merchant
- bar mleczny staff
- accountant
- HR recruiter
- call center representative
- swimming instructor

These are just a couple of jobs of people I've met, and with whom I interact on a regular basis. I told you, I interact with all walks of life, and before I need to know whether it's OK to donate clothes for their kids, invite them on trips, or cook fancy food when they come over. I don't want to impose my lifestyle on anyone. And I know that asking how much one makes a month is a regular question in Poland, but I am not willing to go into that kind of talk.

Thanks!

Have a look here: wynagrodzenia.pl/dane_gus.php
The salaries for about half the jobs you mention are very low and none are generally well-paid.

Thank you! That's indeed what I was looking for, some guidelines! :-)

Just came across the salary for a chief cashier at a very well known upmarket supermarket on the outskirts of Wrocław. The salary for either 7am to 3pm or 2.30pm to 10.30pm was 1700 gross plus a possible bonus of 10%. That's for a senior cashier, ie starzsy.

This makes it all the more puzzling as to why a 50m2 flat is typically 250-350 tys here. (250 tys usually for a high rise communist era block)