According to the information you provided, several pieces of information refer to the same or similar calculation results, which are summarized as follows:

1. Matching principal and interest repayment method: It is pointed out that according to the calculation of the annual interest rate of the central bank's provident fund loans for more than five years, under the matching principal and interest repayment method, the monthly payment of 300,000 loans will be 3,403.17 yuan for 20 years. Then, the monthly supply of 600,000 loans in 20 years should be twice this amount, which is about 6,806.34 yuan.

2. Repayment method in average capital: The annual interest rate is also 3.25%. Under the repayment method in average capital, the monthly loan of 300,000 yuan is 4 125 yuan in the first 20 years, and then it will decrease month by month. With a loan of 600,000 yuan, the first month's contribution is twice this amount, which is about 8,250 yuan, and the subsequent monthly contribution will also decrease month by month.