Crude oil prices took a jolt Friday, dropping under $85 per barrel after a Labor Department report that said the U.S. unemployment rate rose in October. The rate rose from 7.8 percent to 7.9 percent, in line with expectations, but enough to put a backspin on oil prices. Higher unemployment implies demand will decline. West Texas Intermediate crude oil for December delivery gave up $2.29 cents to $84.80 per barrel on the New York Mercantile Exchange. Reformulated gasoline in recent trading added 0.044 cents to $2.578 a gallon. Home heating oil shed 0.8 cents to hit $2.9554 a gallon. Natural gas lost 0.5 cents to reach $3.549 per million British thermal units. At the pump, the average price for a gallon of regular unleaded gasoline was $3.496, down from Thursday\'s $3.507, AAA reported.