How many files does Zhengzhou's social security have

Sixth grade. The social security in Zhengzhou is divided into six grades, namely the lowest grade 4%, the second grade 10%, the second grade 30%, the first grade 60%, the second grade 80% and the third grade 100%. The choice of social security grade is related to the average monthly salary of an individual in the previous year. Flexible employees choose independently between 60% and 300% of the local social security payment base. After the grade is selected, it will be paid according to this standard in that year. If they want to change their grades, they need to wait until the second year.