Seven is the magic numberfor apple. The tech giant reverses its sales slump thanks to its latest iphone reporting its highest quarterly revenue ever. A growing transatlantic divide. The president of the European Council says the new government in washington is one of the biggest threats facing europe. Welcome to World Business report. Im sally bundock. Also in the programme the saudi 0il minister tells the bbc where he believes the price of the black stuff is headed. But first after three quarters in a row of falling revenues, apple has delivered a turnaround. High demand for the iphone seven boosted the tech giant and it reported its highest ever quarterly revenues. In the last three months of the year the firm sold 78. 3 million iphones. Thats a 5 rise since the year before. But its results werent all good. Sales in china fell almost 12 tojust over 16 billion. China has proved to be a difficult market with many homegrown rivals that are much cheaper. Dave lee, our north America Techn