Task: Question Answering
Input (English): Problem: a group of workers had agreed on a very strange payment schedule . each of them would get $ 100 for every day that they had worked , but for every day they did not work will have to return $ 25 . after 30 days they realised they did not earn any money . how many days the workers did not work ? 
Options: a ) 15 , b ) 24 , c ) 30 , d ) 20 , e ) 10
Output (English): b