Correct Answer - Option 2 : 2 years

**Formula used:**

Simple Interest = PTR/100

**Calculation:**

Let the sum of money be 'x'

Interest = x/25

Simple Interest = PTR/100

Here R = T

SI = PR^{2}/100

⇒ x/25 = x × R^{2}/100

⇒ R^{2} = 4

⇒ R = 2

**∴ The number of years is 2 years**