1000 Rs. is invested at 5% per annum simple interest. If the interest is added to the principal after every 10 years, the amount will become 2000 Rs. after :

[A]

[B]

[C]

[D]

After 10 years

Principal for 11th year = 1000 + 500 = 1500 Rs.

∴ Total time

Hence option [B] is correct answer.