Question

Find the simple interest sum ....,...

Answer 1

(i)Let the sum of money be Rs x
According to the question amount is double of principal.
So amount = Rs 2x
Interest = Rs (2x-x)=Rs x
Time =8 years
Let the Rate of interest be r % p.a
Therefore x=(x*8*R)/100
Or R = 100x/8x = 12.5%
(ii)When the sum becomes triple
Amount = Rs 3x
Therefore Interest = Rs 2x
Rate % p.a = 12.5% p.a
Let Time be T years
Therefore 2x = (x*125*T)/100*10
Or. T = 16 years

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