Renminbi can be converted into dollars in foreign exchange banks, and the exchange rate changes every day (just like stocks, it changes according to market demand). The exchange rate of the same bank is the same everywhere, and the exchange rate of different banks is slightly different, so there is no handling fee for exchange, because the handling fee is included in the difference between the bank's buying and selling foreign exchange.

The dollar is the legal tender of the United States of America. At present, the US dollar banknotes in circulation are all the banknotes issued since 1929.

1792 appeared after the passage of the American mint act. At present, the issuance of US dollars is controlled by the Federal Reserve system. Starting from 19 13, the United States established the federal reserve system and issued federal reserve bonds. More than 99% of the banknotes in circulation are federal reserve notes.

The competent department for issuing US dollars is Congress, and the Federal Reserve Bank is responsible for the specific issuance business. After World War II, continental European countries reached an agreement with the United States to use US dollars for international payments. Since then, the dollar has been widely used as a reserve currency in countries outside the United States, and eventually became an international currency.

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1785, the US Congress announced that "the monetary unit of the United States of America is the US dollar". 1786 In August, Congress passed a resolution again, stipulating that 1% of 1 dollar was1cent.

1786 In September, the US Congress ordered the establishment of the Mint Bureau. In the first few months of operation, the mint only produced a small number of copper coins with face values of 0.5 cents,/kloc-0 cents and 2 cents, because the locals had little experience in minting coins. In addition, many states are busy minting coins.