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a barrel of oil is extracted at a cost of $51 then transparent to and from the refinery at a cost of $6 each way. the oil is refined 3 times at $9 per time. whats the profit, in dollars per barrel, if one barrel is sold for $93

a barrel of oil is extracted at a cost of 51 then transparent to and from the refinery at a cost of 6 each way the oil is refined 3 times at 9 per time whats th class=