Stocks opened to the upside Friday, posting modest gains after data showed the U.S. economy added 431,000 jobs in March and the unemployment rate dropped to 3.6% from 3.8%. The Dow Jones Industrial Average DJIA, +0.14% rose 76 points, or 0.3%, to 34,755, while the S&P 500 SPX, +0.10% edged up 0.3% to 4,544 and the Nasdaq Composite COMP, +0.06% gained 0.5% to 14,292.