1. I don't know what you mean. First, because the bank has the buying price and selling price of foreign exchange, buying foreign exchange from the bank is different from buying foreign exchange from you. If you mean software, there will be time errors due to large price fluctuations and so on.

2. RMB is a non-convertible currency.

You are not mistaken, this situation exists. There is triangular arbitrage at this time, but under the action of speculation, the data will tend to be balanced.

The deposit becomes $ 1570.5.