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6 August, 14:06

If the simple interest rate is 5%p. a., how long does it take for the amount to become twice the principal

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  1. 6 August, 14:17
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    A = P + I

    2a = a + PTR/100

    2a = a + 5aT/100

    2a = a (1+T/20)

    2=1+T/20

    T=20 yrs
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