Final answer:
The firm's accounting profit was $50,000.
Step-by-step explanation:
Accounting profit is calculated by subtracting the explicit costs from total revenues. In this case, the firm had sales revenue of $1 million and spent $600,000 on labor, $150,000 on capital, and $200,000 on materials.
Accounting profit = $1,000,000 - ($600,000 + $150,000 + $200,000) = $50,000.
Therefore, the firm's accounting profit was $50,000.