1, loan 12:? The repayment amount is 3107 *143+3670.1= 44791.1yuan, and the interest is 979 1. 1 yuan.
2. Loan 15 years:? The repayment amount is 2632.9 *179+3184 = 474473.1yuan, and the interest is 124473.6438+0 yuan.
Figure 1: 12 year loan
Figure 2: 15 year loan