Just How Many iPads Can Apple Really Sell?

Apple’s new iPad went on sale Friday morning, and as usual consumers lined up outside the tech giant’s retail stores to get their hands on the company’s latest gadget. Although Apple made only incremental improvements to the device — most notably doubling the screen resolution, boosting the processor speed, and adding 4G connectivity — that didn’t stop the faithful from turning out in cities around the world. So just how many iPads can Apple sell?