Shown here is an income statement in the traditional format for a firm with a sales volume of 7,900 units. Cost formulas also are shown: 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) 5,130 Operating income $ 4,099 Required:

a. Prepare an income statement in the contribution margin format.

b. Calculate the contribution margin per unit and the contribution 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 the volume changed from 7,900 units to 11,850 units. (Do not round intermediate calculations.)

c-2. Calculate the firm's operating income (or loss) if the volume changed from 7,900 units to 3,950 units. (Do not round intermediate calculations.) Refer to your answer to part a for total revenues of $34,200.

d-1. Calculate the firms operating income (or loss) if unit selling price and variable expenses per unit do not change and total revenues increase by $11,000. (Round intermediate calculations to 2 decimal places.)

d-2. Calculate the firm's operating income (or loss) if unit selling price and variable expenses per unit do not change and total revenues decrease by $2,500. (Round intermediate calculations to 2 decimal places.)