One very big factor is the local market, and I personally have no idea what ZZ is like. Guangzhou-Dongguan-Shenzhen rates are much higher than in (most) other cities, but the local economy in that part of China justifies this. Dalian, where I live, has seen rates remain pretty stagnant at 90-120 / class hour for the past 8 years, which is part of the reason why I routinely turn job offers down. (When I get back into teaching, I might well move on for just that reason.)
This forum is just one of many places where you can ask this question. Keep asking, you'll get an answer somewhere. (Maybe even a correct answer) Bargain for what you can get. And please, report back.