A sum becomes its double in 10 yr. Find the annual rate

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

1. 1%
2. 5%
3. 10%
4. 20%
5. None of the above

Correct Option: C

Here, n = 2, T = 10 yr
∴ R = 100 (n - 1)/T
= 100(2 - 1)/10
= 100/10
= 10%