1. A certain sum of money triples itself in 5 years at simple interest. In how many years it will be five times?
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By: anil on 05 May 2019 01.48 am
let principle = P simple interest = I time = T yrs rate of interest = R. $$I=frac{PTR}{100}$$ A certain sum of money triples itself in 5 years at simple interest
$$Rightarrow I = 2P$$ $$Rightarrow 2P = frac{P*5*R}{100}$$ $$Rightarrow R = 40$$% In how many years it will be five times
$$Rightarrow I = 4P$$ $$Rightarrow 4P = frac{P*40*T}{100}$$ $$T=10yrs$$ so the answer is option C.
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$$Rightarrow I = 2P$$ $$Rightarrow 2P = frac{P*5*R}{100}$$ $$Rightarrow R = 40$$% In how many years it will be five times
$$Rightarrow I = 4P$$ $$Rightarrow 4P = frac{P*40*T}{100}$$ $$T=10yrs$$ so the answer is option C.