The matching house price is 100x, and the down payment is 30%* 100x=30x (Yuan).
The price of purchasing real estate at a small price of 6,543,800 yuan+400,000 yuan is
14/30=0.466666 (ten thousand yuan)
That is, he can buy a house below 4666.66 yuan/m 2.
4666-4000=666,666/ 120=5.。 . 66 means that he can buy a house below 8+5= 13 floor.