If a sum becomes its double in 10 years, then the annual rate of simple interest is:

Correct option is C

Given:
Time = 10 years
The sum becomes double its original value.
Formula Used:
Simple Interest = $$\frac{P × R × T}{100}$$​​
Amount = Principal + Simple Interest
Solution:
Let the principal sum be P.
Since the amount becomes double, Amount = 2P.
Simple Interest = Amount - Principal
Simple Interest = 2P - P = P
Substitute the values into the formula:
P = $$\frac{P × R × 10}{100}$$​​

1 = $$\frac{10R}{100}$$​​

1 =$$\frac{R}{10}$$​​

R = 10%
Final Answer
So the correct answer is (c)