Law / Picking up a child from preschool in Poland. How much should I charge? [7]

A colleague of my wife has asked if I would be interested in picking her 5 year old son up from preschool. I would pick him up every two weeks for the whole week, for 10 days total a month. I would then take him back to my flat and look after him for one hour.

My wife told me that her colleague pays 200zl per month for the preschool.

So how much would you think is fair to charge her per month?

Bear in mind I don't know her myself, so it's not doing a favour for a friend.

Apologies if this is not the right section for this, as none of the others seemed to work for it.

Work / Polish Natives Teaching English in Schools [3]

So my wife teaches English to people of all ages, albeit at home. Multiple times a few of her pupils have mentioned the English they were taught at school is completely wrong, and how it's a good job they have a tutor as well. If they were minor mistakes I would understand but it's mainly the pronounciation the teachers have wrong, in a big way.

Lives as in "lives at home" is pronounced as "lifes"
Tongue is pronounced as "ton-goo"
Even my wife said she was taught to say certain words wrong, but luckily she was watching a lot of English-speaking television and could hear it correctly.

Has anyone else come across teachers in schools being this bad at teaching English?

My apologies if this is in the wrong section, but this is the only one I see it fitting.