General Motors Acceptance Corp.: GM’s finance and...

General Motors Acceptance Corp.: GM’s finance and mortgage arm said an interest pinch cut its third-quarter earnings 3% to $234.5 million. Detroit-based GMAC, which had 1988 revenue of $13.5 billion, said it financed or leased 676,000 new cars and trucks in the United States in the quarter, up 35%, but borrowing costs averaged 9.38%, up from 8.45%.