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A man sells 3 types of articles at 10%, ...

A man sells 3 types of articles at 10%, 20% and 30% profit respectively. If the ratio of the cost of the articles is 1 : 2 : 3 and the ratio of the number of articles of each type sold is 3 : 2 :1 then What is his net profit? a. `18 %` b. `20 %` c. `25 %` d. `24 %`

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