Math

Susan invests 3 times as much money at 7% as she does at 4%. If her total interest after 1 year is $1250, how much does she have invested at each rate?

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  1. amount invested at 4% --- x
    amount invested at 7% ---- 3x

    solve for x then back-substitute :
    .04x + .07(3x) = 1250

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