Just a word of warning to people using their cards to purchase goods from the Duty Free in the Airport if they offer to charge you in your own countries currency example - if from the UK they offer to charge in pounds, they add a 3.1 percent margin on top of the exchange rate so while you may think it's good to know the cost in your own currency it is actually 3.1 percent more than in Dhirhams and this is in addition to your card holders charges.