Matching principal and interest, the monthly repayment amount is 6334.64 yuan, and the total repayment amount is 760 156.8 yuan, of which the total interest amount is 160 156.8 yuan.
The average capital, the first month repayment amount is 7450 yuan, the monthly repayment principal is 5000 yuan, and the monthly interest is reduced by 20.42 yuan.