Oil rates in international markets down more than 20 cents on Tuesday amid the concerns about the stalled global economy. According to the details, in the Oil rates Brent crude edged down 22 cents, or 0.6%, at $39.61 a barrel while U.S. West Texas Intermediate (WTI) crude futures were down 7 cents, or 0.2%, at $37.26 a barrel. Both contracts