40% of the people read newspaper X, 50% read newspaper Y and 10% read both the papers.What percentage of the people read neither newspaper ?	Choose one
A) 18% B) 20% C) 22% D) 16% E) 30%
n(A)=40,n(B)=50,n(AnB)=10.   n(AuB)=n (A)+n (B)-n(AnB)=40+50-10= 
<gadget id="calculator">40+50-10</gadget>
<output>80</output>
80.   Hence, percentage passed=(100-80)= 
<gadget id="calculator">(100-80)</gadget>
<output>20</output>
20%.   Answer is 20%
<result>B</result>
40% of the people read newspaper X, 50% read newspaper Y and 10% read both the papers.What percentage of the people read neither newspaper ?