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"72. A school has only four classes that contain \\( 10,20,30 \\) and 40 students\nrespectively. The pass percentages of these classes are \\( 20 \\% , 30 \\% , 60 \\% \\) and and and and\n100\\( \\% \\) respectively. Find the pass percentage of the entire school.\na) 56\\( \\% \\)"

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