Seems astronomicaL, and that figure must be for all apps'and accessories?...........Yet, here's a clip from the first page of that link:
"... iPad has already sold around 9 million units, with approximately $6 billion in sales for the device and its accessories as of September, estimates Shaw Wu, an analyst for investment bank Kaufman Bros. And his optimistic prediction is that there could be as many as 400 million iPads shipped worldwide over the next five years—more than one iPad for every man, woman, and child in the United States.'