Translation:Four hundred yuan
RMB stands for RenMinBi. This is the name of China's currency, as USD is the name of America's currency and GBP is the name of the UK's currency. This is not the word you use after a number to show the amount of money. 元 (or more formally, 圆）given in English as "yuan", is the word for the basic unit of money in RMB. That is equivalent to "dollar" for USD or "pound" for GBP. However, in speaking, most people say 块 instead of 元， which is sort of like saying "bucks" instead of "dollars".