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Prepaid expense and other current assets (Details)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Prepaid expense and other current assets      
Deposits to cooperators(2) $ 74,509,497 ¥ 518,720,216 ¥ 40,000,000
Earnings rights associated with loan assets 54,583,585 380,000,000  
Prepaid expense(1) 23,082,803 160,697,858 43,312,139
Input VAT to be deducted 11,369,259 79,150,506  
Interest receivable of consolidated trusts 5,092,335 35,451,817 296,080
Advance to employee 909,249 6,330,011 4,401,076
Receivables from borrowers 173,371 1,206,974 2,173,292
Others 6,408,177 44,612,448 25,010,248
Total prepaid expenses and other current assets $ 176,128,276 ¥ 1,226,169,830 ¥ 115,192,835