NEW YORK, July 31 (Xinhua) -- Oil prices climbed on Friday.
The West Texas Intermediate for September delivery added 1.08 U.S. dollars, or 1.29 percent, to settle at 84.67 dollars a barrel on the New York Mercantile Exchange. Brent crude for September delivery gained 1.09 dollars, or 1.22 percent, to settle at 90.12 dollars a barrel on the London ICE Futures Exchange.
