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Mathematical problems Li Ming borrowed money to buy a house.
1. If Li Ming buys his first house, how many choices does he have? How to return each one? What's the loan interest rate?

There are two ways-equal principal and interest, average capital.

Equal principal and interest method: the money is the same every month and will be paid off in the end. The loan interest rate is 4. 158.

Average capital method: the monthly principal is unchanged, but the interest is decreasing, which means the repayment amount is also decreasing. The final loan interest rate is 4. 158.

2. Which saves money? And calculate the total repayment amount and monthly repayment amount.

Matching principal and interest: the total repayment amount is 525,494.46 yuan, and the monthly repayment amount is 1.459+0.

Average capital: the total repayment amount is 487,629.75 yuan, and the monthly repayment amount is different. The first repayment amount is 1, 872.83 yuan, and the final repayment amount is 836.22 yuan.

The total repayment of equal principal and interest is greater than the total repayment of average capital.

If Li Ming buys a second house, what is the difference between the loan interest rate and the first one? How much will the total repayment increase?

If it is the second house, the loan interest rate is 6.534, which is more expensive than the first house.

The matching principal and interest should be 685,050.15 yuan, with an average principal of 594,846.75 yuan.