A merchant sold 4/10 of his stock at a profit of 5 per unit , 3/10 of his stock at a profit of 4 per unit and remaining stock at a loss of 2 per unit. find his average profit.
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suppose merchant having 100 unit
4/10=40 at profit of 5 per unit ie 60
3/10=30 at profit of 4 per unit ie 42
remaining 3/10=30 at a loss of 2 per unit ie 24
total. 100 stock of which he gain 60+42+24=126
126-100= 26 is his profit
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