Zula, a national manufacturer of lawn-mowing and snow-blowing equipment, segments its business according to customer type: Professional and Residential. Assume the following divisional information was available for the past year (in thousands of dollars). Residential sales: 420000 operating income: 58800 total assets: 210000. Professional sales: 608000 operating income: 152000 total assets: 380000. 1. Calculate each division's ROI. 2. Calculate each division's sales margin. Interpret your results. 3. Calculate each division's capital turnover. Interpret your results. 4. Use the expanded ROI formula to confirm your results from Requirement 1. What can you conclude? 5. Calculate each division's residual income (RI). Interpret your results.