let me clear: example-
1.your salary is 10,000 QR
2.Total 4 family members in your family: each 1200*4=4800 QR.
3.House Rent: 3000 QR
4.now calculate 4800+3000=7800 QR.
5.Now your total salary 10,000-7,800=2,200 QR
this 2,200 QR must be below 1200.if it is more than 1200 QR they will not allow for admission.