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A combination of strong iPhone, Mac and iPad sales could help Apple post strong quarterly numbers April 20, according to analysts. That follows on the heels of reports that Apple sold more than 500,000 iPads during the tablet computer’s first week of general release.

During an April 8 news conference at the company’s Cupertino, Calif., headquarters, ostensibly set up to unveil the upcoming iPhone OS 4, Apple CEO Steve Jobs said that about 600,000 iBooks and 3.5 million iPad applications had been downloaded since the April 3 iPad launch.

The iPad’s opening sales, coupled with strong growth for other products, has analysts predicting a 47 percent jump in quarterly revenue, to $12 billion, according to an April 16 article in The Wall Street Journal. There is an expectation, however, that sales of the iPod will also continue to decline.