D. H. Muller Company presented the following income statement in its 2011 annual report:

Required
a. Based on these data, compute the following for 2011, 2010, and 2009:
1. Net profit margin

2. Return on assets (using total assets)

3. Total asset turnover (using total assets)

4. DuPont analysis

5. Operating income margin

6. Return on operating assets (using end-of-year operating assets)

7. Operating asset turnover (using end-of-year operating assets)

8. DuPont analysis with operating ratios

9. Gross profit margin

b. Discuss your findings.