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a mother wants to $9000 for her son's future education. She invested a portion of the money in a bank certificate(CD account) which earns 4% and the reminder in a savings bond that earns 7%. If the total interest earned after one year is $540, how much money was invested in the CD account

  • math -

    Assuming 9000 was invested, then if x was at 4%, then 9000-x was at 7%.

    .04x + .07(9000-x) = 540
    x = 3000

    $3000 in CD
    $6000 in savings

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