Apple is thinking long-term: R&D spending keeps rising even as revenue dips (AAPL)

Apple's R&D spending jumped again in the face of another quarterly revenue decline, according to the company's earnings on Tuesday.
Apple spent $2.5 billion in the third quarter, up 25% from the year-ago period.That accounts for roughly 5.9% of the total revenue, the highest percentage in at least the past 4 years:The R&D increase comes at a time when Apple continues to face revenue declines across the board. In the third quarter, Apple reported $42.3 billion in revenue, d