Rs.100 doubled in 5 years when compounded annually. How many more years will it take to get another Rs.200 compound interest?
Choose the correct choice from the following answers:
A) 10 years B) 5 years C) 7.5 years D) 15 years E) 8 years
Explanatory Answer   Rs.100 invested in compound interest becomes Rs.200 in 5 years.   The amount will double again in another 5 years.   i.e., the amount will become Rs.400 in another 5 years.   So, to earn another Rs.200 interest, it will take another 5 years.   Answer 5 years
<result>B</result>
Rs.100 doubled in 5 years when compounded annually. How many more years will it take to get another Rs.200 compound interest?