Correct Answer - Option 1 : 40 Years

**Given: **

Sum of Money becomes 3 times

Rate of simple interest = 5% per annum

**Formula Used;**

Simple interest = (Principal × rate × time)/100

Amount = Principal + Simple interest

**Calculation:**

Let the principal be Rs A

Then after tripling Amount will become 3A

Simple interest = 3A - A = 2A

2A = (A × 5 × time)/100

⇒ Time = (2A × 100)/(A × 5) = 40 years

**∴ The Time period is 40 years.**