A firm has net sales of $14,500,000, Cost of Goods Sold $8,000,000, Depreciation Expense of $1,000,000, Selling and Administrative Expenses of $2,350,000, Interest Expense of $500,000, and an average tax rate of 25%. Calculate the firm's Gross Profit Margin 11.1% 15% 21.7% 44.8%