Task: Question Answering
Input (English): Problem: tough and tricky questions : word problems . mike , sarah and david decided to club together to buy a present . each of them gave equal amount of money . luckily sarah negotiated a 20 % discount for the present so that each of them paid 4 dollars less . how much did they pay for a present ? 
Options: a ) 20 , b ) 36 , c ) 48 , d ) 60 , e ) 72
Output (English): c