In how many years, interest will become equal to the sum invested at 5% per annum at simple interest?

- 20 years
- 21 years
- 22 years
- 23 years
- 24 years

Option 1 : 20 years

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**Given:**

Rate of Interest = 5%

Interest = Principal

**Formula used:**

S.I = (P × R × T)/100

Where, S.I = Simple Interest

P = Principal

R = Rate of Interest

And, T = Time

**Calculation:**

Let the principal amount and time be Rs. P and T respectively.

Then, S.I = (P × R × T)/100

⇒ (P × 5 × T)/100 = P

⇒ T = 20 years

**∴ In 20 years, the interest will become equal to the sum invested.**

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