Final answer:
The total revenue for a competitive firm producing 20 units at a market price of $10 per unit is $200, which is option c).
Step-by-step explanation:
The student's question is about calculating the total revenue for a competitive firm at a given market price and production quantity. The total revenue for a competitive firm producing 20 units at a market price of $10 per unit is $200, which is option c).
When the market price is $10 per unit and the firm produces 20 units, the total revenue can be computed by multiplying the price per unit by the number of units produced.
Total Revenue = Price per Unit × Number of Units
Total Revenue = $10 × 20 = $200
Hence, the total revenue at the production of 20 units is $200, which corresponds to option c).