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15 October, 21:23

If ben invests $4000 at 4% interest per year, how much additional money must he invest at 5 1/2% annual interest to ensure that the interest he receives each year is 4 and 1/2% of the total amount invested

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  1. 16 October, 00:19
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    When Ben invests $4000.00 at 4%, he will have an additional $160 every year added to the 4000. Then the 4000 adds to the 4000 and the 4% is calculated.

    Since Benn needs 4 and 1/2%, which is $180.00, this is the amount of money that is 4 and 1/2% of the 4000.

    So if he adds an additional $180 to the total amount of $4000 this will give him the 4 and 1/2% of his initial investment.

    So we can determine that x is the amount he needs to invest.

    If 0.04 (4000) + 0.055x=0.045 (4000+x)

    160+0.055x=180+0.045x

    0.010x=20

    x=$2000
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