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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-example-1

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93 (profit) - expenses
Expenses: 51 (extraction) + 12 ($6 to and from) + 27 ($9 x3 for refining)
Total expenses equals 90, so
Profit - expenses
93 - 90
The answer is C, 3
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