http://www.cia.gov/cia/publications/...k/geos/ch.html
GDP - per capita:
purchasing power parity - $5,600 (2004 est.)
Except china is nothing if not a nation of disparities currently... so your median income should be quite a bit lower.
$2880 then isn't too bad for a chinese worker. Not great or anything, but not horrible. Probably translates to 30k USD income in america.