Subject: mathqa
Question: john had a stock of 1000 books in his bookshop . he sold 75 on monday , 50 on tuesday , 64 on wednesday , 78 on thursday and 135 on friday . what percentage of the books were not sold ?
Option: 
A: 59.8 %
B: 34.9 %
C: 66.5 %
D: 43.5 %
Answer: A