$3,750QR . . what's that? QR13,000 plus acco? Not as good as civil engineers but better than teachers. As noted above, familiar food will be American prices or more; sensibly-purchased vegies much less. Booze and western-style meals all at Western prices. Cars and fuel less. Go figure, as they say.
One possible extra expense is in acco. If it's pretty awful, you might feel a need to spend money on making it habitable. However, that cost depends on your own standards and what they give you. Most Westerners don't have much of a problem with what they're given.