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cfc198
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Let brought X items. Costs 10x . Selling (12x X 1/3)= 4x and (9x X 2/3)= 6x , total 10x , so no profit no loss.

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Basic maths.
3 item each at 10 rs = 30 rs
1 item sold at 12 rs
2 items sold at 9 rs
18+12=30

Purchase price= selling price
No profit no loss.

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