1. It depends on the location of the house, but the rent you mentioned should not be very good. The annual investment income is 1400*12/600000=2.8

2. The total repayment amount 30 years * 3,700 yuan * 12 months = 1.332 million yuan, annual capital cost (133.2-71) / 71/30 = 2.9

3. I don’t know what your loan amount is. I’ll temporarily assume 710,000 yuan. Calculation,

4. The above does not take into account the annual growth value of the property.

Conclusion: If you have a good investment project, you can sell the small house and pay back 300,000 in advance, and use the remaining balance for investment.