A sum of money put at simple interest trebles itself in 15 years. The rate per cent per annum is?

Question

Accepted Answer

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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