U.S. stocks opened higher on Friday, getting a boost from a rate cut in China and better-than-expected earnings results from tech companies such as Alphabet, Microsoft and Amazon. The main indexes were on track to book solid weekly gains for the fourth week in a row. The S&P 500 opened 19 points, or 0.9%, higher at 2,071. The Dow Jones Industrial Average rose 115 points, or 0.7%, to 17,603. The Nasdaq Composite began the day up 96 points, or 2%, at 5,0168.
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