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In 2002, how to calculate the social security payment base of 3 1 1 and the individual payment of 18.66?

In 2002, the base of social security contributions was 3 1 1, and the calculation method of individual contributions was 18.66:

The proportion of social security contributions is generally as follows: endowment insurance: 20% for units and 8% for individuals; Medical insurance: 8% for units and 2% for individuals; Unemployment insurance: 2% for the employer and 0/%for the individual. Industrial injury insurance and maternity insurance are entirely borne by enterprises.