Shown here is an income statement in the traditional format for a firm with a sales volume of 8,000 units. Cost formulas also are shown: Revenues $32, 000 Cost of goods sold ($6, 000 + $2. 10/unit) 22, 800 Gross profit $ 9, 200 Operating expenses: Selling ($1, 200 + $0.10/unit) 2, 000 Administration ($4, 000 + $0.20/unit) 5, 600 Operating income $ 1, 600 Required: a. Prepare an income statement in the contribution margin format. b. Calculate the contribution margin per unit and the contribution margin ratio. c. Calculate the firm's operating income (or loss) if the volume changed from 8,000 units to 1. 12,000 units. 2. 4,000 units. d. Refer to your answer to part a for total revenues of $32,000. Calculate the firm's operating income (or loss) if unit selling price and variable expenses per unit do not change and total revenues 1. Increase $12,000. 2. Decrease $7,000