Task: Question Answering
Input (English): Problem: what is the compound interest on rs . 7000 at 8.5 % p . a . compounded half - yearly for 5 years . 
Options: a ) 3616.5 , b ) 3613.5 , c ) 3313.5 , d ) 3616.5 , e ) 3113.5
Output (English): b