Task: Question Answering
Input (English): Problem: if 80 lamps can be lighted 5 hours per day for 10 days for rs . 21.25 , then the number of lamps which can be lighted 4 hours daily for 30 days for rs . 76.50 , is ? 
Options: a ) 100 , b ) 110 , c ) 120 , d ) 130 , e ) none of these
Output (English): c