Shown here is an income statement in the traditional format for a firm with sales volume of 15,000 units; Prepare an income statement in the contribution margin format. Calculate the forms operating income (or loss) if the volume changed from 15,000 units to 10,000 units. (Do not round intermediate calculations) Refer to your answer to part a when total revenue units $105,000. Calculate the firms operating income (or loss) selling price and variable expenses do not change and total avenues increases by $15,000, (Do not round intermediate calculations). Calculate the firms operating income (or loss) if unit selling price and variable expenses do not change and total revenues decrease by $10,000. (Do not round intermediate calculations.) Shown here is an income statement in the traditional format for a limit with a sales volume of $5,000 units Prepare an income statement in the contribution margin format. Calculate the contribution margin per unit and the contribution margin ratio. (Do not round your immediate calculations. Round contribution margin per unit to 2 decimal places.)