Answer:
The profit of the firm is 100 units.
Step-by-step explanation:
To calculate the profit of the firm, you can use the following formula:
Profit = Total Revenue - Total Cost
Total Revenue is calculated as the product of the price (P) and the number of units sold (Q):
Total Revenue = P * Q
In this case, P = 5 and Q = 100, so:
Total Revenue = 5 * 100 = 500
Total Cost (TC) is given as 400.
Now, you can calculate the profit:
Profit = Total Revenue - Total Cost
Profit = 500 - 400
Profit = 100