30。 At present, the smoking certificate is divided into 1 to 30 files, with 30 files being the highest, and the higher the number of files, the higher the monthly supply. If it's just a general convenience store, 10 yuan is enough. The more goods you take every month, the higher the gear. Of course, it does not mean that the higher the number of files, the better. Generally speaking, it is better to do what you can, because if the number of files is too high, the KPI of each month is also very high.