Task: Question Answering
Input (English): Problem: mary works in a restaurant a maximum of 60 hours . for the first 20 hours , she is paid $ 8 per hour . for each overtime hour , she is paid at a rate which is 25 % higher than her regular rate . how much mary can earn in a week ? 
Options: a ) 300 , b ) 420 , c ) 560 , d ) 320 , e ) 400
Output (English): c