Fixed costs increase unspecified beyond 20,000 units Steps:

• Current total contribution: 20,000 × $4 =$80,000; profit = $80,000 -$8,000 = $72,000.
• At 30,000 units, total contribution: 30,000 × $4 =$120,000; additional contribution = $40,000.
• Fixed costs remain $8,000 up to 20,000 units but increase beyond that.
• Increase in fixed costs not provided, so new profit = $120,000 - (unknown new fixed costs) cannot be calculated. Not enough information.

Final answer: Not enough information.