Shown here is an income statement in the traditional format for a firm with a sales volume of 7,600 units. Cost formulas also are shown $34,800 21,000 $13 800 Revenues Cost of goods sold ($5,800+$2 00unit) Gross profit Selling ($1,160+50.11/unit) Administration ($3,750+0 25/unit) 1,996 5,650 $ 6,154 Operating income Required: a. Prepare an income statement in the contribution margin format Variable expenses Total variable expenses Fixed expenses Total fioxed expenses 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.) Contribution margin per unit Contribution margin ratio c-1. Calculate the firms operating income (or loss) if the volume changed from 7,600 units to 11,400 units. (Do not round intermediate calculations.)