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11. In what time will a sum of money be three times of itself, the rate of interest being20%p. a.​

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218 cents Angel
Answer:

 Let the principal =Rs.x. Amount =Rs.3x, Time =20 years

∴S.I.=Rs.3x−Rs.x=Rs.2x

 Rate =(x×202x×100)%p.a.=10%p.a.

 Now, Principal =Rs.x, Amount =Rs.2x, Rate =10%p.a.

S.I.=Rs.2x−Rs.x=Rs.x

∴ Time =x×10x×100=10 years.

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