Please help me with this answer.

The 2019 financial statements for Growth Industries are presented below. Sales and costs are projected to grow at 30% a year for at least the next 4 years. Both current assets and accounts payable are projected to rise in proportion to sales. The firm is currently operating at 75% capacity, so it plans to increase fixed assets in proportion to sales. Interest expense will equal 10% of long-term debt outstanding at the start of the year. The firm will maintain a dividend payout ratio of 0.40 What is the required external financing over the next year? Note: Enter excess cash as a negative number with a minus sign