Calculate, 2,600 per month for 10 years is: 2,600*12*10=312,000 yuan; 2,000 per month for 15 years, and it will be used in the 10th year: 2,000*12*10=240,000 yuan, still Difference: 5*12*2000=120,000 yuan. I guess you have equal principal and interest. So: you have paid off the first type, 312,000 yuan, and only 24W for the second type. There is still a difference of 12W. If it is equal principal and interest, it should be You don't have to pay back 12W, but only the remaining principal, which must be less than 12W. Therefore, 31.2W-24W=7.2W, which is an extra 7.2W. There is a special calculation formula for the second principal that should be repaid. For details, see the webpage/common/modules/housemarket/housemarket3_grgjj.php.