Task: Question Answering
Input (English): Problem: john had a stock of 1000 books in his bookshop . he sold 20 on monday , 120 on tuesday , 200 on wednesday , 250 on thursday and 300 on friday . what percentage of the books were not sold ? 
Options: a ) 68 % , b ) 74 % , c ) 76 % , d ) 62 % , e ) 89 %
Output (English): e