about money declaration

Hi ,after I have declared to the customs that I have more than US 5000 or 20000 RMB which is allowed by the authority for foreigners flying into China,
1)will I be asked by the customs to go one side for questioning as to why I need to bring so much money into China?
2)what happens to the excess money that I have declared?will the customs allow me to bring into China or will they confiscate the extra ?
need these two answers badly.Thank you