You have to pay attention to whether the 5,000 you paid at that time is also included in the deduction. The true concept of 5,000 worth 10,000 should be 15,000. Instead of 5,000 for 10,000, the result is that the total price is reduced by 10,000. In fact, the real discount is only 5,000. Because it includes your previous 5,000. Ask the real estate consultant in detail on site, and you will sign a contract when you pay. Just read some agreements carefully.