Matching principal and interest method: loan principal: 50,000 yuan, assuming annual interest rate: 50.000%, loan life: 3 years; Monthly repayment of principal and interest: 2705.7 yuan, total repayment of principal and interest: 97405.2 yuan, * * * interest payable: 47405.2 yuan. The interest paid in 1 month is: 2083.33; The first 1 month principal repayment is: 622.37; Since then, the monthly interest repayment amount has decreased and the principal has increased. (without considering the adjustment of interest rate in the middle)