Operating expenses include unspecified additional advertising cost Steps:

• Identify base current operating expenses as $5,000 total for sales of$19,000.
• Note that additional advertising increases sales to $20,000 and non-advertising expenses by$7,000.
• Determine new non-advertising expenses as unknown base non-ad + $7,000.
• Recognize total operating expenses require additional advertising cost, which is missing. Not enough information.

Final answer: Not enough information.