Restate the following income statement in contribution margin format. (Round answers to 2 decimal places, e.g. 15.25 or 15.25%) Sales ($50 per unit) Less cost of goods sold ($33 per unit) Gross margin Less operating expenses: Salaries Advertising Shipping ($1.46 per unit) Operating income $806.00 410.00 154.76 $5,300.00 3,498.00 1,802.00 1,370.76 $431.24