From Dubai I buy 100,000/- Euro and fly to Amsterdam and sale the Euro Currency in Amsterdam(Holland). I make a handsome Profit due to the currency difference. Is it Halal for me?

As Euro Currency is cheap in Dubai and a little expensive in Frankfort or Amsterdam, I buy 5 cents cheaper in Dubai and sale it 5 cents more in Amsterdam. Also there is a chance for loss as well if the rate goes down. Also at Amsterdam airport they never ask me how much money do u have? but if they ask I will tell them I have 500$ in my pocket. I hide the 100000 Euro in my shoes. At Dubai airport they see my currency and ask for the original recite, Which I show them and they have no problem. I am not sure about the Amsterdam Rules in carrying currency. I make a 1000$ profit in one trip. Is it HALAL or NOT? Please reply May Allah Tala give you Reward ameen.