When will salary be paid? In what currency? What is official exchange rate?

Salaries vary from institution to institution and region to region. They also vary among public schools and private schools. Salaries are dependent on the teacher's education and background experience.  The base salary for a foreign teacher in China is 2,200 Yuan RMB. However, most institutions pay much more than that and salaries can range from 3,000 Yuan RMB to as high as 7,000 Yuan RMB, depending on the teacher qualifications and the teaching demands. These are determined by the host institution and can be negotiated by the teacher if there is a question. Any salary earned above 4,000 Yuan RMB is subject to a 10% tax.
Salaries are paid in cash in Chinese Yuan Renminbi (RMB). Normally, salaries are paid by the 5th day of the month and are paid for the month worked. This means that an incoming teacher might not receive their first salary payment until the beginning of the second month of teaching. However, some schools will pay one months ahead as a courtesy, realizing the teacher has nothing for the first month. NOTE: A teacher is allowed to exchange up to 70% of their salary for foreign currency, normally United States Dollars (USD). Current exchange rate is: $1USD = 8.27RMB.