Its a very subjective thing , sometimes there are hidden cost here and there , so 8k can be a good life for single , but barely enough for a family of 3 (wife not working) in city ,it all depends.
But Chinese use to say 开源节流 ,means create more income flow and try to jimat ......by looking at the calculation , some thing still can be save further more............but as i say ,it all depends...........