1. Suppose the loan amount is 490,000, 620,000 minus the down payment130,000, the loan period is 20 years and 240 months, and the loan interest rate is 4.9%, calculated according to the current commercial loan interest rate.
2. Loan principal ××1+monthly interest rate, repayment period ÷ 1+ monthly interest rate, repayment period-1, = 490000× 0.004083×1+0.004083,240.