The first time I bought a house, I borrowed 300,000 yuan from Shenzhen Development Bank and mortgaged it for 25 years. I repaid the principal and interest with the same amount. What is the total monthly loan repayment and the interest? If the interest rate drops by 15%, the annual interest rate will be 5.2 19%, the monthly payment will be 1792.26 yuan, and the 25-year interest rate will be 237,678.19 yuan (if the national interest rate is not adjusted for 25 years);

If the interest rate does not go down, the annual interest rate is 6. 14%, the monthly payment is 1958.66 yuan, and the 25-year interest rate is 287,597.72 yuan (if the national interest rate is not adjusted for 25 years);