Facing pressure to either fix his ailing bank or sell it, acting Bank One Corp. chief executive officer Verne G. Istock on Tuesday asked Wall Street to believe that he can rebuild profits by the end of the year.

Mr. Istock told a roomful of skeptical Wall Street analysts that the company will take a $725 million charge in the fourth quarter, slicing earnings for the period in half but helping to begin the repair of the battered First USA Inc. credit card division.

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