UAE area is 33,000 dh's a month tax free. Out of that if you are a single guy you are paying about 5,000 a month for accomodation and say another 3,000 for medical insurance, utilities (power,water etc.) which are things in the normal world you pay out of after tax dollars. But lets just deduct those things and see whats left. About 25,000 dh's beer and food money per month. That is 6,800 US dollars a month after tax and after major living expenses. $81,600 US a year after tax, after rent, after medical insurance, after electricity bill paid, and after water bill and phone rental paid.
Big mac rule here would be 10 dh's per Big Mac (may be 9 dh's not sure) so 30,000 Big Macs. Cheers.