A school having five classes only have student strength of 10, 10, 20, 20 and 40 respectively. The pass percentages of these classes are 20%, 30%, 60%, 90% and 100% respectively. What is the pass percentage for the entire school?
Choose the correct choice from the following
A) 56%
B) 75%
C) 34%
D) 66%
E) 46%
20% of 10+30% of 10+60% of 20+90% of 20+100% of 40   =2+3+12+18+40= 
<gadget id="calculator">2+3+12+18+40</gadget>
<output>75</output>
now 75 of 100= 75%   ANSWER:75%
<result>B</result>
A school having five classes only have student strength of 10, 10, 20, 20 and 40 respectively. The pass percentages of these classes are 20%, 30%, 60%, 90% and 100% respectively. What is the pass percentage for the entire school?