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Amy has $200 less invested at 9% than she does at 6.5%. If the annual return from the two investments is the same, how much is invested at each rate?

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    If she invested $X at 9%, then she invested $(X+200) at 6.5%.

    Since the return is the same, then
    X*0.09 = (X+200)*0.065
    X(0.09-0.065)=200*0.065
    0.025X = 13
    X = 13/0.025 = $520 at 9%
    X+200 = $720 at 6.5%

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