A burst of hiring in February pushed stocks higher as the Dow logged its a sixth straight increase. US employers added 236,000 jobs last month and the jobless rate fell to 7.7 percent from 7.9 percent in January, the Labor Department said. Investors feel strong job growth shows employers are confident despite higher taxes and government spending cuts. McDonald’s added to the Dow’s gains after the fast-food restaurant chain reported that a key sales figure fell 3.3 percent in February, but the decline wasn’t as bad as analysts expected. Skullcandy fell after the headphone maker projected a big loss and a drop in sales.