In a sample of books, 10 percent are 100-200 pages long, and 60 percent have more than 100 pages. What percentage of the books are more than 200 pages? Select the correct option.
A) 40  B) 50  C) 60  D) 70  E) 80
60 percent are more than 100 pages --&gt; This means 60 percent of books are either 100-200 pages or more than 200 pages   Already, we know % of 100-200 pages= 10 %   So, % of 200+ page books = 60 % - 10 % = 50 % .. =&gt; (B).. Is it correct ?
<result>B</result>
In a sample of books, 10 percent are 100-200 pages long, and 60 percent have more than 100 pages. What percentage of the books are more than 200 pages?