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DuPont Corporation has net income of $13.92 billion, an effective tax rate of 37%, interest expense of $1,700 million, an asset turnover of 3.4, and $21 billion in total assets, of which $11 billion is debt. Define & Explain the DuPont system of company analysis; use it to calculate DuPont's ROE which should also be decomposed into each of its 5 named constituent 5 ratios taken from Holden Ch.18; explaining what financial insight can be provided by each ratio for this particular company. Would you invest? (Up to 12 marks)