Still hard to answer this question as it depends on your life style and the food that you are eating. Some people will cook, some will just go and buy their meals everyday.

If you will cook, then you would have the choice what to buy and how much would you pay for these stuff.

If you will buy from restaurants then you got no choice but to pay 15 Q.R minimum per meal for a good one.

If the company will provide you the accommodation, then calculate it like 50 Q.R Max. per day for all of your expenses and you will find that 1500 Q.R would be the total. It can be less or more, still depending on you.