Monthly repayment amount = [principal * monthly interest rate *( 1+ monthly interest rate) repayment months]/[(1+monthly interest rate) repayment months-1]

In which: monthly interest = residual principal * monthly interest rate of loan.

Monthly principal = monthly contribution-monthly interest

Calculation principle: from the beginning of monthly contribution, the bank first charges interest on the remaining principal, and then charges the principal; The proportion of interest in monthly contributions decreases with the decrease of remaining principal, and the proportion of principal in monthly contributions increases, but the total amount of monthly contributions remains unchanged.

Calculation formula of monthly decreasing repayment

Monthly principal and interest repayment amount = (principal/repayment months)+(principal-accumulated repaid principal) * monthly interest rate.

Monthly principal = total principal/repayment months

Monthly interest = (principal-accumulated principal repayment) * monthly interest rate

Calculation principle: the amount of principal returned every month is always the same, and the interest decreases with the decrease of the remaining principal.