The specific monthly payment also depends on your loan execution interest rate and repayment method. The new house purchased by the buyer is the first time to buy a house, and the minimum down payment for commercial loans is 30%, so the down payment is 120 times 30 = 360,000, and the loan is 840,000, which can be paid off in 30 years. According to the benchmark interest rate of commercial loans of 6.55, the monthly payment is 5337.36 yuan, and the total interest for 30 years is 65436 yuan.