Shown here is an income statement in the traditional format for a firm with a sales volume of 10,000 units. Cost formulas also are shown: Revenues $ 50,000 Cost of goods sold ($9,000 + $2.60/unit) 35,000 Gross profit $ 15,000 Operating expenses: Selling ($2,300 + $0.15/unit) 3,800 Administrative ($4,700 + $0.25/unit) 7,200 Operating income Calculate the contribution margin per unit and the contribution margin ratio. Note: Round "contribution margin per unit" to 2 decimal places