The computing giant is looking forward to a very happy — and lucrative — holiday season. Its fourth-quarter results trounced forecasts with a reported $42.1 billion in revenue and 12 percent growth for its strongest showing in almost two years. This included a 16-percent jump in U.S. iPhone sales. Earnings grew 20 percent, and net income was up 13 percent, hitting $8.5 billion. The only bad news? Its iPad sales, off seven percent from the previous quarter, continue to slide.