The middle price is announced by the state every day;
The buying price is the price after the bank reduces a certain spread on the basis of the middle price (the spread of each bank is different). It is divided into the buying price of paper money and the buying price of foreign exchange, and the buying price of foreign exchange is higher than the buying price of paper money. The buying price of paper money is the lowest in the quotation.
You sell foreign exchange to the bank and exchange it for your due RMB at the purchase price.
The selling price is the price after the bank increases a certain spread on the basis of the middle price. The price of paper money and foreign exchange is the same, and it is the highest in the list price.
If you buy foreign exchange from the bank, you will convert it into RMB payable at the selling price.