25. Internal Growth. If the profit margin of the firm in Practice Problem 23 is 6%, what is the maximum possible growth rate that can be sustained without external financing? (LO3) 26. Using Percentage of Sales. The 2009 financial statements for Growth Industries are presented below. Sales and costs in 2010 are projected to be 20% higher than in 2009. Both current assets and accounts payable are projected to rise in proportion to sales. The firm is currently operating at full capacity, so it plans to increase fixed assets in proportion to sales. What external financing will be required by the firm? Interest expense in 2010 will equal 10% of long-term debt outstanding at the start of the year. The firm will maintain a dividend payout ratio of .40. (LO2)