Shown here is an income statement in the traditional format for a firm with a sales volume of 16,000 units:

Revenues	$	192,000
Cost of goods sold ($9,500 + $2.85/unit)		55,100
Gross profit	$	136,900
Operating expenses:
Selling ($2,100 + $1.00/unit)		18,100
Administration ($4,700 + $0.40/unit)		11,100
Operating income	$	107,700

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

b. Calculate the contribution margin per unit and the contribution margin ratio. (Do not round intermediate calculations. Round your answers to 2 decimal places.)

c-1. Calculate the firm's operating income (or loss) if the volume changed from 16,000 units to 21,000 units. (Do not round intermediate calculations.)

c-2. Calculate the firm's operating income (or loss) if the volume changed from 16,000 units to 8,000 units. (Do not round intermediate calculations.)

Refer to your answer to part a when total revenues were $192,000.

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

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