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Shares of Goldman Sachs (NYSE:GS) closed in the red on Friday. Sources tell Bloomberg that the bank accidentally used the wrong Treasury note as a benchmark for the offering of $1 billion worth of five-year 2.875-percent notes from Ford Motor‘s (NYSE:F) finance unit, adding about $1.5 million in extra interest to the cost of the offering. Goldman charged Ford a lower fee on the sale in order to compensate for the mistake — the car maker reportedly paid just 0.25 percent to underwrite the bonds, as opposed to 0.35 percent.