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25 October, 02:20

The combined yearly interest for x dollars invested at 13% and 20,000-x dollars invested at 8% is

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  1. 25 October, 04:30
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    total = 1600 + 0.05x

    Step-by-step explanation:

    I = Prt

    You want the sum of the interest from the two investments. The interest at 13% is ...

    I = Prt = x (0.13) (1) = 0.13x

    The interest at 8% is ...

    I = Prt = (20000-x) (0.08) = 1600 - 0.08x

    Then the total interest earned is ...

    total = 0.13x + (1600 - 0.08x)

    total = 1600 + 0.05x
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