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How to calculate the credibility of Jiangxi mobile users?

Hello, I'm from Jiangxi Mobile, and credit refers to the maximum amount of arrears. The phone bill of Jiangxi mobile users can be raised to 30 yuan in 1 ~ 2 years, to 100 yuan in 2 ~ 4 years, to 150 yuan in 4 ~ 6 years, and to 200 yuan in 6 years or above. Just edit the message "6050" to 650. Hope to adopt!