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Problem 1222 (Algo) Prepare a contribution margin format income statement; answer what-if questions LO 12-7, 12-8, 12-9, 12-12 Shown here is an income statement in the traditional format for a firm with a sales volume of 17,000 units: 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 17,000 units to 1. 22,000 units. 2. 9,000 units. d. Refer to your answer to part a when total revenues were $170,000. Calculate the firm's operating income (or loss) if unit selling price and variable expense per unit do not change and total revenues 1. Increase by $12,000. 2. Decrease by $8,000