Rio National Inc. recently issued new securities (common shares and bonds) to finance a new project with a cost $16 million. The equity issued had a flotation cost of 8%, while the debt issued had a flotation cost of 2.5%. Total flotation cost of this new security issue was $1.2 million. If Rio National Inc. issued new securities in the same proportion as its target capital structure, what is the company’s target debt to equity ratio?