3800 yuan. Official website of the People's Bank of China shows that the minimum down payment of Yi 'an s580 is 15, and the interest rate is 1. 15, and the monthly loan for 60 installments is 3,800 yuan. Monthly mortgage refers to the monthly repayment amount that the lender should pay to the lending bank during the repayment period, including the principal and corresponding interest, when purchasing commercial houses and motor vehicles by bank mortgage.