A shop keeper had some books. He sells 40% books and still has 420 books. Originally, he had  Choose the correct choice from the following choices.
A) 588 books	B) 600 books	C) 620 books	D) 700 books	E) None of these
Explanation :   Suppose originally he had x books.   Then,(100-40)% of x = 420.   =&gt;60/100x = 420   =&gt;x = (420 100 / 60   =&gt;x=700.   Answer : 700 books
<result>D</result>
A shop keeper had some books. He sells 40% books and still has 420 books. Originally, he had