Question 1172416
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The cost function is the fixed cost added to the product of the variable cost and the number of items manufactured.  In other words, the overhead plus x times the production cost.


The revenue function is the sale price times the number sold.


The profit function is the revenue function minus the cost function.  If the number manufactured is different than the number sold, then the profit function is a two-variable function.  But since your problem statement implies that the number manufactured is equal to the number sold, it is a single-variable function in x.


																
John
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