3,000 QAR is above Qatar's minimum wage but still tight for Doha. Rent for a shared room is 800-1,200 QAR. Food costs 600-900 QAR. Transport 200-400 QAR. A single worker can save 500-1,000 QAR/month.
For a family, 3,000 QAR is very difficult. Doha rents for a 2-bedroom start at 4,000 QAR, which exceeds the entire salary. Employer-provided housing is essential at this salary level.