A cement manufacturer has supplied the following data:

Tons of cement produced and sold257,000Sales revenue$1,079,400Variable manufacturing expense$426,000Fixed manufacturing expense$285,000Variable selling and administrative expense$88,000Fixed selling and administrative expense$225,000Net 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