A barrel of crude oil id extracted from shale at a cost of $$\$ 51$$, and then transported to and from the refinery at a cost of $$\$ 6$$ each direction. Oil is processed three times at the refinery plant, at a cost of $$\$ 9$$ each time. What is the profit, in dollars per barrel, if one barrel is sold for $$\$ 93$$? (Profit is equal to revenue minus expenses.)
Correct option is C. $$3$$
Costing in the process of making and transporting oil are:
Extraction$$=$50$$
Transportation to and fro$$6+6=$12$$
Processing is done 3 times at $$ $9$$ each time$$3*9=27$$
Total Cost $$=50+12+27=$$ $$ $90$$
Selling Price=$$ $93$$
Profit$$=93-90=$3$$