Task: Question Answering
Input (English): Problem: the average salary of a person for the months of january , february , march and april is rs . 8000 and that for the months february , march , april and may is rs . 8200 . if his salary for the month of may is rs . 6500 , find his salary for the month of january ? 
Options: a ) 2177 , b ) 2876 , c ) 4500 , d ) 5700 , e ) 6711
Output (English): d