Calculated at the annual interest rate of 6.00%, the repayment methods of principal are equal. After 20 years of loan, the repayment amount is 45,729 yuan in the first month, and then it is reduced by 3.04 yuan every month. After 20 years, the total repayment amount is 7,987,499 yuan, including 5 million yuan of principal and 2,987,500 yuan of interest.