A school having four classes only have student strength of 10, 40, 30 and 20 respectively. The pass percentages of these classes are 20%, 30%, 60% and 100% respectively. What is the pass percentage for the entire school? Pick: A) 56% B) 76% C) 52% D) 66% E) 46%
20% of 10+30% of 40+60% of 30+100% of 20   =2+12+18+20= 
<gadget id="calculator">2+12+18+20</gadget>
<output>52</output>
now 52 of 100= 52%   ANSWER:52%
<result>C</result>
A school having four classes only have student strength of 10, 40, 30 and 20 respectively. The pass percentages of these classes are 20%, 30%, 60% and 100% respectively. What is the pass percentage for the entire school?