Tons of places within walking distance. You can easily get a great meal for way under 40 QAR. Easiest thing for him to do is just go for a walk or ask anyone at the hotel for directions.

Also, out the front of the hotel across the street to the right and down Al Mirqab Al Jadeed street (behind the Hardees on ring C) there is place called Thia Snack (no more than 20 QAR for a meal) and a number of other popular relatively inexpensive resturants. Try the Hammour. It will take longer to cross the street than to walk to the place.