can someone provide steps to solve;

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 0.50.

what is the external finance over the next year

The 2019 financial statements for Growth Industries are presented below.

Cost	250000
EBIT	150000
interest expense	30000
taxable income	120000
taxes (21%)	25200
net income	98400
dividends	47400
addition to retained income	47400
balance sheet:
assets			Liabilities
Current Assets	9000		current liabilities
accounts receivable	14000		accounts payable	16000
inventory	27000		total current liabilities	$16,000
total current assets	50000		LTD	300000
net plan and equip.	340000
total assets	$390,000		stock equity
			common stock	15000
			retained earnings	59000
			total LiabliLiabilities plus stock equity	390000