Tehran - Current oil price of about $100 a barrel are "satisfactory" according to OPEC's Secretary General Abdullah El-Badri, who is visiting Iran. Tehran,  currently chairing the producers organization's rotating presidency, asked to maintain current production levels judging current prices as positive. El-Badri said he is optimistic that at the next OPEC summit, which will be held in Vienna in December, member countries will agree that production quotas are satisfactory, considering the "global economy's special situation".