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13 September, 10:11

a state employees pension fund invested a total of one million dollars into two accounts that earned 3.5 and 4.5 annual simple interest. At the end of the year, the total interest earned was 42,000. How much was invested at each rate

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  1. 13 September, 11:08
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    Let the investment in first account be x and this account is earning 3.5% interest

    So Interest on this account is 3.5% of x = 0.035x

    So the investment in second account would be (1,000,000-x) and this account is earning 4.5% interest

    So the interest on this account is 4.5% of (1,000,000-x) = 0.045 * (1,000,000-x)

    Given that total interest for the year is $42,000

    So we have

    0.035x + 0.045 (1,000,000-x) = 42,000

    0.035x - 0.045x + 0.045*1,000,000 = 42,000

    -0.01x + 45,000 = 42,000

    -0.01x = 42,000-45,000

    -0.01x = - 3000

    0.01x = 3000

    x = 3000/0.01

    x = 3,00,000

    Therefore Investment in one account s 300,000 and the investment in other account is 1,000,000-300,000 = 700,000
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