The firm had sales of $100 million, Cost of goods sold of $40 million, SG&A of $10 million and Depreciation of $30 million, interest of $4 million and pays a tax rate of 20%. What is the firm's operating margin?

The firm had sales of $100 million, Cost of goods sold of $40 million, SG\&A of $10 million and Depreciation of $30 million, interest of $4 million and pays a tax rate of 20%. What is the firm's operating margin