Currency Exchange Profits Currency Exchange?

Currency exchange? - currency exchange profits

I am confused with the exchange rate. I have seen a 10 yuan from someone online registration and the exchange rate. I put on different exchange rates between the countries and the United States to observe. Anyway, my question is whether you can store up to 500 for a particular currency per U.S. dollar, which means you can do much more there is "buy less," when we talked about the cost of dollars?