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21 November, 16:43

Kelly opened a bank account that earns 1.2% simple interest each year. After 7 years, Kelly will earn $126 in interest. How much did Kelly deposit when she opened the account?

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  1. 21 November, 18:23
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    13.4 dollars

    Step-by-step explanation:

    The final amount is given by:

    F=I (1+rt)

    Where

    I = initial amount

    r = interest rate

    t = time interval

    F = final amount

    Now in our case

    r = 1.2

    t = 7

    F = $126

    Therefore I=F / (1+rt) = 126 / (1+1.2*7) = 13.4 dollars.
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