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In: AccountingShown here is an income statement in the traditional format fora firm with a sales...Shown here is an income statement in the traditional format fora firm with a sales volume of 7,900 units. Cost formulas also areshown: Revenues $ 34,200 Cost of goods sold ($5,700 + $2.20/unit)23,080 Gross profit $ 11,120 Operating expenses: Selling ($1,180 +$0.09/unit) 1,891 Administration ($3,550 + $0.20/unit) 5,130Operating income $ 4,099 Required:a. Prepare an income statement in the contribution marginformat.b. Calculate the contribution margin per unit and thecontribution margin ratio. (Do not round intermediate calculations.Round contribution margin per unit to 2 decimal places.)c-1. Calculate the firm's operating income (or loss) if thevolume changed from 7,900 units to 11,850 units. (Do not roundintermediate calculations.)c-2. Calculate the firm's operating income (or loss) if thevolume changed from 7,900 units to 3,950 units. (Do not roundintermediate calculations.) Refer to your answer to part a fortotal revenues of $34,200.d-1. Calculate the firm’s operating income (or loss) if unitselling price and variable expenses per unit do not change andtotal revenues increase by $11,000. (Round intermediatecalculations to 2 decimal places.)d-2. Calculate the firm's operating income (or loss) if unitselling price and variable expenses per unit do not change andtotal revenues decrease by $2,500. (Round intermediate calculationsto 2 decimal places.)