WASHINGTON - Bank customers could be earning billions of dollars more of interest on their savings and do not know it.

A study of Federal Reserve Board data, commissioned by Providian Financial Corp. and the Consumer Federation of America and released Tuesday, found that 58% of Americans who use traditional savings and money market accounts do not know the interest rate their account pays. Thirty percent said there is little difference between the interest paid by a savings account and that paid by a certificate of deposit.

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