If the company is giving you an apt make sure they are paying for the elec and water. Are they going to provide a telephone land line. All this can add upt to 1000 riyals. What about car? It is 1700 per month to rent one. Food for a family of four can run into about 2000 riyals or more a month. Cell phone just depends how much you use.

Is the apt furnished? What about airfare? Are they paing for insurance? I guess this should get you started. All the best. Where are you coming from? It might be nothing if you are coming from USA or UK but from other countries it might be alot. Best of luck.