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Gina plans to invest $12,000, part at 4% simple interest and the rest at 6% simple interest. What is the most she can invest at 4% and still be guranteed at least $650 in interest per year?

  • Math -

    x at 4%
    (12,000 -x) at 6%
    then
    .04 x + .06(12000-x) = 650
    -.02 x + 720 = 650
    .02 x = 70
    x = 3500

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