Answer: -$20,000
Step-by-step explanation:
Economic profit = Accounting profit - Opportunity cost
Accounting profit = Total revenue - Explicit cost.
Total revenue = $50,000
Explicit cost = $20,000
Opportunity cost = $30,000 + $20,000 = $50,000.
Accounting profit = $30,000
Economic profit = $30,000 - $50,000 = -20,000