College Algebra

A total of $14,000 is invested in 3 accounts earning 3%, 4%, and 5% annual interest. The combined interest for one year is $539. If the amount invested at 5% is three times the amount at 4%, find the amount invested at 3%.

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  1. If the amounts are x,y,z then we have

    x+y+z = 14000
    .03x + .04y + .05z = 539
    z = 3y

    Now just solve for x

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  2. 7200

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