Which file does Zhongshan individual pay 348 social security?

Second gear. The basic old-age insurance for urban and rural residents paid by social security in Zhongshan is divided into nine grades, and the payment standards are set as 240 yuan, 360 yuan, 600 yuan and 900 yuan 180 yuan, 1200 yuan, 1800 yuan, 3,600 yuan and 4,800 yuan respectively. The insured can choose to pay 348 as the second gear. The insured can only choose one payment standard in a natural year. ?