my mom taught in China for 2 years....she saved up CRAZY money...she taught at regular school for ex-pats, and took my brother with her....so she wasnt teaching to Chinese per se (its rediculously expensive to go to that school, so it was all european and korean students). Anywho, in Tienjin (not sure of spelling) to take a cab is 7 Yuan for first 5 or 6 km...7 Yuan is just over a dollar...so u do the math...food was cheap, her 2 bedroom condo with heated floors, really nice place was about 25% of her monthly salary. I'm not too sure on the specifics, but she was paying for all the house bills here, and all the bills there and still managed to save about 25G's.
But again, this is China, not Korea...