At CI if a certain sum of money is doubled in 4 years then the amount will be four fold in how many ...........

Quant (SSC) Compound Interest

At CI, if a certain sum of money is doubled in 4 years, then the amount will be four fold in how many years ?

7years

4years

10years

8years

- In compound interest, when a sum doubles in a certain period, it follows an exponential growth pattern.

- If a sum doubles in 4 years, it means the amount becomes \(2P\) (where \(P\) is the principal) in 4 years.

- For the amount to become fourfold or \(4P\), it doubles twice.

- The first doubling (to \(2P\)) takes 4 years.

- The second doubling (to \(4P\)) will take another 4 years.

- Therefore, the total time is 4 + 4 = 8 years.

- Option 4: 8 years is the correct answer.

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