Matching principal and interest method: the total loan amount is 40,000, assuming the annual interest rate is 5.30%. The loan term is 3 years: the monthly repayment of principal and interest is 1204.23 yuan, the total repayment is 43,352.28 yuan, and the total interest payable is 3,352.28 yuan. The interest paid in the first month is 176.67 and the principal paid in the first month is1027.56; The interest paid in the second month is 172. 13 and the principal paid in the second month is1032.1; Since then, the monthly interest repayment amount has decreased and the principal has increased. (without considering the adjustment of interest rate in the middle)

Formula of equal principal and interest method (n is the number of months): monthly repayment amount = principal * monthly interest rate *[( 1+ monthly interest rate) n]/[( 1+ monthly interest rate) n- 1]