John had a stock of 1100 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? Options.
A) 50.4% B) 63.4% C) 66.5% D) 34.9% E) 43.5%
Let N be the total number of books sold. Hence   N = 75 + 50 + 64 + 78 + 135= 
<gadget id="calculator">75 + 50 + 64 + 78 + 135</gadget>
<output>402</output>
402   Let M be the books NOT sold   M= 1100 - N = 1100 - 402= 
<gadget id="calculator">1100 - 402</gadget>
<output>698</output>
698   Percentage   63.4%ooks not sold / total number of books= 698/1100 = 0.634 = 63.4%   correct answer 63.4%
<result>B</result>
John had a stock of 1100 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?