$650/mo is the avg. wage _after tax_ (around 150kHUF) -- I should have mentioned that. You're absolutely right that I got the minimum wage wrong (I meant net minimum wage though).
You did mention it: "the average net wage is $650/mo"; I assumed "net wage" meant "wage after taxes". There's no star to indicate that this phrasing is the result of a later edit.
Oops, you're right. I assumed that the grandparent is right and I made a mistake without looking at my original post. Well, lack of self-confidence :) (I didn't edit that part of the original post.)