1246 yuan. Because the lending institution will calculate the monthly repayment amount according to the loan amount, interest rate and loan term, the specific calculation method is that the monthly repayment amount is equal to the loan principal multiplied by the monthly interest rate (1 plus the monthly interest rate) n divided by (1 plus the monthly interest rate) n minus 1, in which the loan principal is 40,000, the monthly interest rate is 0.58% and the loan term is 3 years, which can be substituted.