Please explain it clearly on each steps, thanks

Preferred Products has the following cost information available for 2012:

Direct materials	$4.00 per unit
Direct labor	$3.00 per unit
Variable manufacturing overhead	$2.00 per unit
Variable selling and administrative costs	$1.00 per unit
Fixed manufacturing overhead	$25,000
Fixed selling and administrative costs	$10,000

During 2012, Preferred produced 5,000 units out of which 4,600 units were sold for $30 each. Required:

A.	Calculate Preferred's net operating income assuming the company uses variable costing.
	$
B.	Calculate Preferred's net operating income assuming the company uses absorption costing.
	$