Just over two years <a href=" http://goldentabs.com/categories/Other/Buy-Cheap-Topamax.html#struck ">price of topamax 25mg</a> However, revenues from paid-for apps are expected to fall below half of all revenue by 2016, as earnings from both in-app purchasing and advertising grow. By 2017, total revenues are expected to reach $76bn, with paid-for apps accounting for 37.8 percent, in-app purchases 48.2 percent, and advertising 14 percent.