John had a stock of 800 books in his bookshop. He sold 62 on Monday, 62 on Tuesday, 60 on Wednesday, 48 on Thursday and 40 on Friday. What percentage of the books were not sold?  Choose the correct option:
A) 78%
B) 66%
C) 62%
D) 64%
E) 60%
Let N be the total number of books sold. Hence   N = 62 + 62 + 60 + 48 + 40= 
<gadget id="calculator">62 + 62 + 60 + 48 + 40</gadget>
<output>272</output>
272   Let M be the books NOT sold   M= 800 - N = 1400- 272= 528   Percentage   66%ooks not sold / total number of books = 528/800= 
<gadget id="calculator">528/800</gadget>
<output>33/50 = around 0.66</output>
0.66= 66%   correct answer 66%
<result>B</result>
John had a stock of 800 books in his bookshop. He sold 62 on Monday, 62 on Tuesday, 60 on Wednesday, 48 on Thursday and 40 on Friday. What percentage of the books were not sold?