Problem 12-20 Prepare a contribution margin format income statement; answer what-if questions LO 7, 8, 9,12 Shown here is an income statement in the traditional format for a firm with a sales volume of 17,000 units: $204,000 58.450 145,550 Revenues Cost of goods sold (S10,000 $2.85/unit) Gross profit Operating expenses: Selling ($2,150+$0.80/unit) Administration ($5,000 $0.35/unit) 15,750 $118,850 Operating income Required a. Prepare an income statement in the contribution margin format. ribution Margin Income Statement S 204,000 evenues Variable expenses: t of goods sold $ 48,450 13,600 5,950 ng expenses Administrative expenses Total variable expenses 68,000 136,000 on margin Fixed expenses: Cost of goods sold S 10,000 2,150 5,000 ng expenses Administrative expenses Total fixed expenses Operating income 17,150 S 118,850 c-2. Calculate the firm's operating income (or loss) if the volume changed from 17,000 units to 9,000 units. (Do not round intermediate calculations.) Operating income This is a numeric cell, so please enter numbers only. Refer to your answer to part a when total revenues were $204,000 d-1. Calculate the firm's operating income (or loss) if unit selling price and variable expense per unit do not change and total revenues increase by $12,500. (Do not round intermediate calculations.) d-2. Calculate the firm's operating income (or loss) if unit selling price and variable expense per unit do not change and total revenues decrease by $8,000. (Do not round intermediate calculations.) Operating income