Thanks Mandi for the feedback,

yes if I a buy 25k second hand car, the 4% will be correct.

yes Internet and Tv are included for free.

my food expenses in US are less than 400$ per month.

Even if double clothing it is still a fair offer I guess.

Of course we plan to go out with my wife and kids to get advantage of the many activities in Qatar.

Also, do you know if my wife is autorised to do some kind of work while in Qatar ? she has a bachelor in chemistry and she can teach french language in private classes.