A man had a stock of 500 books in his bookshop. He sold 25 on Monday, 50 on Tuesday 30 on Wednesday, 100 on Thursday and 150 on Friday. What percentage of the books were not sold?
Select the correct option:  A) 8%  B) 10%  C) 29%  D) 44%  E) 16%
Let N be the total number of books sold. Hence   N = 25 + 50 + 30 + 100 + 150= 
<gadget id="calculator">25 + 50 + 30 + 100 + 150</gadget>
<output>355</output>
355   Let M be the books NOT sold   M= 500 - N = 500- 355= 
<gadget id="calculator">500- 355</gadget>
<output>145</output>
145   Percentage   Books not sold / total number of books= 145/500= 
<gadget id="calculator">145/500</gadget>
<output>29/100 = around 0.29</output>
0.29= 29%   correct answer 29%
<result>C</result>
A man had a stock of 500 books in his bookshop. He sold 25 on Monday, 50 on Tuesday 30 on Wednesday, 100 on Thursday and 150 on Friday. What percentage of the books were not sold?