Matching principal and interest method: loan principal: 65,438+0,000,000; Assumed annual interest rate: 3.250%; Loan term: 30 years; Monthly repayment of principal and interest: 4,352.06 yuan; Total repayment amount: 1.56674 1.6 yuan; And * * interest payable: 56,674,65438. The interest paid in 1 month is: 2708.33; The first 1 month principal repayment is:1643.73; Since then, the monthly interest repayment amount has decreased and the principal has increased. (without considering the adjustment of interest rate in the middle)