Task: Question Answering
Input (English): Problem: the equal amounts of money are deposited in two banks each at 15 % per annum for 3.5 years and 5 years respectively . if the difference between their interests is rs . 144 , find the each sum ? 
Options: a ) 640 , b ) 500 , c ) 3000 , d ) 1000 , e ) 2000
Output (English): a