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A sum becomes its double in 10 years. Find the annual rate of simple interest.

A. 8% B. 5% C. 10% D. 20% Answer: Option C
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Solution(By Apex Team)

Let Sum be Rs. x and Let SI = Rs. x Time = 10 years. $\begin{array}{l} \therefore \text { Rate }=\frac{\text { SI } \times 100}{\text { Principal } \times \text { Time }} \\ =\frac{x \times 100}{x \times 10} \\ =10 \% \text { per annum. } \end{array}$