6. Essex Corporation manufactures machinery used in the production and packaging of food products In analyzing Essex Corporation's financial statement information for 2019, the following key accounting information was noted: Income Statement Sales Cost of Goods Sold Gross Margin. Selling, General and Administrative Expenses Operating Income 2019 $7,650,400 $5,280,000 $2,370,400 $1,530,400 $840,000 Balance Sheet Operating Assets $4,565,000 Required: a. Compute Essex Corporation's margin for 2019 b. Compute Essex Corporation's turnover for 2019 C. Compute Essex Corporation's return on investment for 2019 d. Recompute Essex Corporation's return on investment if sales increase from $7,650,400 to $7,800,000, thereby resulting in an increase in operating income from $840,000 to $880,000