How many more years will it take to get another Rs.420 compound interest, if Rs.210 doubled in 2 years when compounded annually.?	Select the correct option
A) 2 years  B) 3 years  C) 1 years  D) 4 years  E) 5 years
Explanatory Answer   Rs.210 invested in compound interest becomes Rs.220 in 2 years.   The amount will double again in another 2 years.   i.e., the amount will become Rs.240 in another 5 years.   So, to earn another Rs.220 interest, it will take another 2 years.   2 yearsnswer 2 years
<result>A</result>
How many more years will it take to get another Rs.420 compound interest, if Rs.210 doubled in 2 years when compounded annually.?