Monthly payment is 8800 yuan. According to relevant information, the house is 654.38+0.36 million, with a down payment of 400,000 and a loan of 960,000. Now the mortgage interest rate is about 5%, and the loan interest of 960,000 times 0.005 equals 4,800, which is interest. The principal of 960,000 yuan is 960,000 divided by 20 years and 240 installments, and the principal plus interest is 4,000 yuan.