work on these figures:

2 BHK - QAR 4500-5000/ month
Water/ Elec - QAR 200/ month
Car - QAR 1800/ month
Groceries - QAR 2000/ month (depending on your lifestyle)
Dining out - QAR 500/ once a week at a decent restaurant.

Could be a li'l more/ less depending on the lifestyle you lead.