Apple's iPhone business, which didn't exist three years ago, now represents a whopping 40 per cent of the company's revenue and has been the company's biggest revenue generator for three quarters in a row.
During the March quarter, iPhone revenue grew 124 per cent year-over-year to $US5.4 billion, or 40 per cent of Apple's $US13.5 billion in total revenue. Because of high profit margins on the iPhone, it's likely Apple's biggest profit contributor, too. (But that's another chart.)
Apple's second-biggest business is its Mac computer division, which grew 27 per cent year-over-year in the March quarter to $US3.8 billion, or 28 per cent of Apple's overall sales.