Task: Question Answering
Input (English): Problem: the average monthly salary of 20 employees in an organisation is rs . 1600 . if the manager ' s salary is added , then the average salary increases by rs . 100 . what is the manager ' s monthly salary ? 
Options: a ) 3700 , b ) 3890 , c ) 88798 , d ) 2789 , e ) 2891
Output (English): a