John had a stock of 1400 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?
Select:  A) 81.57%  B) 36.5%  C) 80.67%  D) 56.5%  E) 80.57%
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= 1400 - N = 1400- 272= 
<gadget id="calculator">1400- 272</gadget>
<output>1_128</output>
1128   Percentage   Books not sold / total number of books= 1128/1200 = 0.81 = 80.57%   correct answer 80.57%
<result>E</result>
John had a stock of 1400 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?