math

A college student earned $8900 during summer vacation working as a waiter in a popular
restaurant. The student invested part of the money at 10% and the rest at 9%. If the student
received a total of $831 in interest at the end of the year, how much was invested at 10%?

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  1. If x at 10%, the rest (8900-x) at 9%, then calculate the interest:

    .10x + .09(8900-x) = 831
    x = 3000

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    posted by Steve

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