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Simple interest

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  1. A sum of money put at simple interest trebles itself in 15 years. The rate per cent per annum is ?
    1. 131/3%
    2. 162/3%
    3. 122/3%
    4. 20%
Correct Option: A

Let principal = P
Then, SI = 2P & Time = 15 years
∴ Required rate = (100 x SI) / (P x T) = (100 x 2P) / (P x 15) = 200/15 = 131/3 per annum


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