Task: Question Answering
Input (English): Problem: the average monthly income of p and q is rs . 2050 . the average monthly income of q and r is rs . 5250 and the average monthly income of p and r is rs . 6200 . the monthly income of r is : 
Options: a ) 5100 , b ) 4900 , c ) 9400 , d ) 1500 , e ) 3200
Output (English): c