I would like to visit China as a businessman, what type of visa is require and how much fee for this

Yes, you are right, an M is ok. Documents on the commercial activity issued by a trade partner in China, or trade fair invitation or other invitation letters issued by relevant entity or individual is required for application. Office hours for application: 9:00 –12:00am on working days. But I am not sure is same day processing available now. Please contact the embassy directly for more information. Tel: (0088-02)9856064 (Please call between 15:00 and 17:00)