Apple's hidden multi-billion dollar business could be the star of Monday's earnings (AAPL)

Getty/Justin Sullivan Apple will announce its fiscal first quarter earnings on Monday afternoon. Here's what you need to know, starting with Wall Street expectations, compiled from analyst estimates by Bloomberg: Revenue: $77.4 billion, up slightly from $74.9 in the year-ago quarter. Adjusted EPS: $3.22, down slightly from $3.28 in theyear-ago quarter. Gross margin: 38.39%, down from 40.1% in the year-ago quarter. iPhones sold: 76 million, up from 75 million in theyear-ago quarter. iPhone averag...