8、 The collection efficiency of a cyclone is 45% over the size range 0-5 mm, 80% over the size
96% for particles exceeding 10 mm. Calculate the total efficiency of
collection for the following dust: 50% 0-5 mm, 30% 5-10 mm, 20% above 10 mm.
(A) 86% (B) 71% (C) 53% (D) 65.7%
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