It depends on what your standards of living are.

Expect school fees of about QR35000 per year per child at most schools. Your housing allowance is enough for a 3 bedroom apartment or villa. Expect groceries to be about QR5000 per month for a family of 5. You can buy a decent car for QR2000 per month.

Entertainment and eating out at good restaurants is very expensive and clothing is also expensive.