Day Ko Incorporated presented the following comparative income statements for 2011 and 2010:

Required

a. How did 2011 net sales compare with 2010?

b. How did 2011 net earnings compare with 2010?

c. Calculate the following for 2011 and 2010:

1. Net profit margin

2. Return on assets (using ending assets)

3. Total asset turnover (using ending assets)

4. DuPont analysis

5. Operating income margin

6. Return on operating assets (using ending assets)

7. Operating asset turnover (using ending assets)

8. DuPont analysis with operating ratios

9. Return on investment (using ending liabilities and equity)

10. Return on equity (using ending common equity)

d. Based on the previous computations, summarize the trend in profitability for this firm.