Loan amount = total house price-down payment amount = 762231-152446.2 = 609784.8 yuan.

The loan term is 30 years, that is, 360 months.

The interest rate is 4.0%, and the monthly interest rate is/12 = 4.0%/12 = 0.3333%.

Matching principal and interest repayment is adopted, and the calculation formula of monthly repayment amount is: monthly repayment amount = loan principal × monthly interest rate ×( 1+ monthly interest rate) × loan months/((kloc-0/+monthly interest rate) × loan months-1).

Substituting the above data into the formula, the monthly repayment amount is calculated as: 609784.8× 0.003333× (1+0.00333) 360/(1+0.00333) 360-1) = 2780.

This is the monthly repayment amount within 30 years, and the specific amount may be slightly different due to the bank's calculation method and other expenses.