Sales 22,000,000 Variable expenses 18,500,000 Contribution margin 3,500,000 Fixed expenses 2,800,000 Net operating income 700,000 Average operating assets were $9,000,000. It's minimum required return was 6%. 1. What is the company's margin percentage? 2. What is the company's turnover? 3. What is the company's return on investment? 4. What is the company's residual income