Yes you can bargain Salary

You Must Ask Salary 20K above + House + Vehicle

You may count expenses/Month as

Housing - 5000-7500 Qrs
Vehicle - 1300 - 2000 Qrs
Children education 1000/One child
Food 2000 - 2500 Qrs (2 Adult + 2 Kid)

approximate expenses is between 9300 to 13000 Qrs/Month in a medium/ above medium life styile ( Also you can live an expenses around or less than 7500 qrs in a sharing level.)