Ernie invested Rs. 2000, with compounded interest annually. After 3 and half years the investment doubled. How many more years will it take before he earns another Rs. 4000 compound interest? Choose the correct choice from the following choices: A) 3.5 years B) 1.5 years C) 2.5 years D) 3 years E) 5 years
Explanatory Answer   Rs.2000 invested in compound interest becomes Rs.4000 in 3.5 years.   The amount will double again in another 3.5 years.   i.e., the amount will become Rs.4000 in another 3.5 years.   So, to earn another Rs.4000 interest, it will take another 3.5 years.   3.5 yearsnswer 3.5 years
<result>A</result>
Ernie invested Rs. 2000, with compounded interest annually. After 3 and half years the investment doubled. How many more years will it take before he earns another Rs. 4000 compound interest?