In words: four.
Notes on writing capital figures:
① The words "RMB" shall be added before the capital figures, and the capital figures shall be written immediately after the words "RMB" without leaving any space.
② It is not allowed to use Chinese characters such as "one, two, three, four", "one, two, three, four", or "twenty, block, Mao, another", nor to create simplified characters.
③ The amount in words in Chinese shall be written in block letters or running script.
④ If the amount in Chinese words is up to "yuan", the word "whole" (or "positive") should be written after "yuan".