The following data are from the accounting records of Niles Castings for year 2.

Units produced and sold		88,000
Total revenues and costs
Sales revenue	$	330,000
Direct materials costs		65,000
Direct labor costs		35,000
Variable manufacturing overhead		17,000
Fixed manufacturing overhead		43,000
Variable marketing and administrative costs		11,000
Fixed marketing and administrative costs		37,000

Required:

a. Prepare a gross margin income statement.

b. Prepare a contribution margin income statement.