- 25 years
- 20 years
- 15 years
- 18 years

Option 2 : 20 years

Formula used:

SI = (PRT/100)

Amount = SI + P

**Concept used:**

A sum of money tripled means, Amount is three times of the principal

Calculation:

Let the sum of money be P

Amount in 10 years = 3P

Amount = (PRT/100) + P

3P = (PR/10) + P

⇒ 2P = (PR/10)

⇒ R = 20%

According to question, Amount = 5P

Let the time required for the sum to become five times be T

5P = (P × T/100) + P

⇒ 4P = (P × 20 × T/100)

⇒ 4 = (T/5)

⇒ T = 20 years

∴ Time taken to five times the sum is 20 years.

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