(Answered) Tree machines i ii and iii manufacture 30 30 and 40

Statistics

Three machines I, II, and III manufacture 30%, 30%, and 40% respectively, of the total output of certain items. Of them, 4%,3%, and 2%, respectively are defective. One item is drawn at random from the total output and is tested.
(i) What is the probability that the item is defective?

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