at what rate per cent p.a simple interest will a sum triple itself in 16 years

Let  the rate of interest and sum of money be r % p.a and Rs. P respectively.

Given, A = 3P and t = 16 years

Amount = Principle + S.I.

A = P + S.I.

⇒ S.I. = AP

Thus, the rate of interest is .

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