A school having four classes only have student strength of 10, 20, 30 and 40 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) 34%
D) 66%
E) 46%
20% of 10+30% of 20+60% of 30+100% of 40   =2+6+18+40= 
<gadget id="calculator">2+6+18+40</gadget>
<output>66</output>
now 66 of 100= 66%   ANSWER:66%
<result>D</result>
A school having four classes only have student strength of 10, 20, 30 and 40 respectively. The pass percentages of these classes are 20%, 30%, 60% and 100% respectively. What is the pass percentage for the entire school?