If an investment earns a simple interest rate of 4% per annum then how many years will it take for the investment to double itself?

Correct option is A

Given:

Rate of interest = 4%

Formula Used:

​$$SI = \frac{P \times R \times t}{100}$$​​

Solution:

Let Principle sum be P

Here amount is double =2P

Interest = 2P - P = P

​$$P=\frac{P \times 4 \times t}{100}$$​​

​$$t =\frac{100}{4} =25\%$$​​