Wei Hui Social Security Bureau, how do freelancers pay endowment insurance and how much?

Freelance employment belongs to flexible employment pension insurance. Because freelancers can't check their salary income, the national social security stipulates that the average social salary of the previous year is the payment base, and several payment grades are set from 60% to 300% of the average social salary. The insured can choose their own grades, and the rate is 20%. how much is it? You need to consult the Social Security Bureau.