b. Calculate the contribution margin per unit and the contribution margin ratio.

c-1. Calculate the firm's operating income (or loss) if the volume changed from 19,500 units to 24,500 units.

c-2. Calculate the firm's operating income (or loss) if the volume changed from 19,500 units to 11,500 units.

Refer to your answer to part a when total revenues were $214,500.

d-1. Calculate the firm's operating income (or loss) if unit selling price and variable expense per unit do not change and total revenues increase by $13,500.

d-2. Calculate the firm's operating income (or loss) if unit selling price and variable expense per unit do not change and total revenues decrease by $9,500.

Shown here is an income statement in the traditional format for a firm with a sales volume of 19,500 units: Revenues Cost of goods sold ($10,000 $2.85/unit) Gross profit Operating expenses $214,500 65,575 $148,925 Selling ($2,450 $1.10/unit) Administration ($4,550 $0.35/unit) 23,900 11,375 $113,650 Operating income Required a. Prepare an income statement in the contribution margin format. Contribution Margin Income Statement Variable expenses: Total variable expenses Fixed expenses: Total fixed expenses