British Petroleum Co. PLC announced that its...

British Petroleum Co. PLC announced that its wholly owned subsidiary, BP North America Inc., has been renamed BP America Inc. and, as a result of a merger just completed, now holds 100% of Standard Oil Co. . . . First RepublicBank Corp. said it will add $325 million to its reserve for loan losses in the second quarter of 1987, relating to its loans outstanding to developing countries . . . Attorneys for AT&T;, the Justice Department and a wide variety of businesses began arguments in federal court on whether the seven regional Bell telephone companies created by the breakup of AT&T; should be allowed to provide manufacturing, information and long-distance services . . . The Federal Reserve reported that the average yield for one-year T-bills rose slightly to 6.77% last week after averaging 6.73% the week before . . . Wal-Mart Stores said it completed the acquisition of Super Saver Warehouse Club.