Need help with this question. See attached balance sheet.

Chapter 14 -- Financial Forecasting United Health Products has the following balance sheet: Current Accounts assets $5,000 payable Notes payable $1,000 Net fixed Long-term assets $5,000 debt Common equity $4,000 $1,000 $4,000 Total liabilities Total assets $10,000 and equity $10,000 Business has been slow; therefore, fixed assets are vastly underutilized. Management believes it can double sales next year with the introduction of a new product. No new fixed assets will be required, and management expects that there will be no earnings retained next year. What is next year's external financing requirement