Task: Question Answering
Input (English): Problem: in a hostel there were 100 students . to accommodate 25 more students the average is decreased by some rupees . but total expenditure increased by rs . 500 . if the total expenditure of the hostel now 8500 , find decrease of average budget ? 
Options: a ) 20 , b ) 15 , c ) 12 , d ) 18 , e ) 24
Output (English): c