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At what rate percent per annum simple interest will a sum triple itself in 15 years?

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Let the sum be Rs x. Then,

P= Rs x, A=Rs 3x, SI=A-P= (3x-x)=2x  and T=15 years.

	herefore R=frac100	imes S.I.P	imes T=(frac100	imes 2xx	imes 15)%

	herefore R=frac403%=13	frac13%

Hence the required rate is 13	frac13% p.a.

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Deependra Verma

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