Matching principal and interest method: loan principal: 20,000 yuan, assuming annual interest rate: 30.000%, loan life: 2 years, monthly repayment amount of principal and interest:118.26 yuan, total repayment amount: 26,838.24 yuan, * * interest payable: 6,838.26 yuan.

The interest paid in 1 month is: 500; The first 1 month principal repayment is: 618.26; Since then, the monthly interest repayment amount has decreased and the principal has increased. (without considering the adjustment of interest rate in the middle)