Task: Question Answering
Input (English): Problem: a grocer has a sale of rs . 6435 , rs . 6927 , rs . 6855 , rs . 7230 and rs . 6562 for 5 consecutive months . how much sale must he have in the sixth month so that he gets an average sale of rs . 6500 ? 
Options: a ) 4551 , b ) 4771 , c ) 4991 , d ) 4881 , e ) 4661
Output (English): c