A cement manufacturer has supplied the following data:

Tons of cement produced and sold	257,000
Sales revenue	$1,079,400
Variable manufacturing expense	$426,000
Fixed manufacturing expense	$285,000
Variable selling and administrative expense	$88,000
Fixed selling and administrative expense	$225,000
Net operating income	$55,400

What is the company's unit contribution margin? (Do not round your intermediate calculations.)

$2.00 per unit

$0.22 per unit

$2.20 per unit

$4.20 per unit