	arco arc up on higher ings estimate atlantic richfield co s stock rose sharply after analyst eugene nowak of dean witter reynolds inc raised his ings estmates of the company traders said arco jumped to nowak said that based on an average oil price of dlrs a barrel in the company should  about dlrs a share next year based on an average oil price of dlrs a barrel arco should  about five dlrs a share the company ed dlrs a share in if oil prices should rise to an average of dlrs a barrel he said arco could record ings of dlrs a share nowak said his increased estimates come after the company told analysts yesterday that its first quarter ings will comfortably cover its quarterly dividend requirement of one dlr a share nowak said the company has done an outstanding job reducing expenses and arco is poised to generate greater ings power he said first quarter ings will likely exceed the company s expectations stated yesterday and be in the dlr a share range reuter 
