Apple reportedly registered profits as high as 78 per cent from its App Store in 2018 and 2019, an expert witness for Epic Games has testified, as the Cupertino-based tech giant and Fortnite game developer prepare for a legal battle in the US beginning Monday. According to The Verge, expert Ned Barnes testified that "information from Apple's Corporate Financial Planning and Analysis group show the App Store had a 77.8 percent operating margin in 2019, and 74.9 percent in 2018". Apple has contested that interpretation of the data, saying "we don't have a separate profit and loss statement for...