Every working day, the People's Bank of China will announce the official foreign exchange quotation (exchange rate) of China, and the head offices of commercial banks will take this as the middle price, and within the scope allowed by the People's Bank, they will float a certain number of points up and down to determine the foreign exchange quotation of the bank on that day, including cash buying price, cash buying price and selling price (cash with cash).

So different banks can have different exchange rates.