Shown here is an income statement in the traditional format for a firm with a sales volume of 7,800 units. Cost formulas also are shown: $34,300 21,590 $12,710 Cost of goods sold ($5,600 $2.05/unit) Gross profit Selling ($1,160+S0.10unit) Administration ($3,550 $0.15/unit) 1,940 4,720 S 6,050 Operating income Required: a. Prepare an income statement in the contribution margin format. Income Statement Variable expenses: Total variable expenses Fixed e Total fxed e b. Calculate the contribution margin per unit and the contribution margin ratio. (Do not round intermediate calculations. Round contribution margin per unit to 2 decimal places.) margin per unit margin ratio c-1. Calculate the firm's operating income (or loss) if the volume changed from 7,800 units to 11,700 units. (Do not round intermediate calculations.)