Answer:
The correct option is 3. A firm calculate its profit as " Total profit = Total revenue - Total cost".
Step-by-step explanation:
Profit of a firm is financial gain. It is the difference between the total amount earned by the firm and the total amount spent in buying, operating, or producing something.
It other words, profit is the difference between total revenue and total cost.
A firm calculate its profit as
Total profit = Total revenue - Total cost
Where, total revenue is the sum of fixed and marginal revenue, total cost is the sum of fixed cost and marginal cost.
A firm calculate its profit as " Total profit = Total revenue - Total cost". Therefore the correct option is 3.