RMB is the currency used in China, issued by China People's Bank. Yuan is one unit of RMB, the most popular used, like Dollar of USA currency.
The exchange rates of RMB Yuan between other currencies vary and fluctuate all the time. And even at one certain time point, Exchange rates between two certain currencies also vary at banks and Internet paying platform.
The web page below is the real-time exchange rates of RMB Yuan between other currencies at Bank of China. It is simply for your reference.