A tile manufacturer has supplied the following data: Boxes of tiles produced and sold Sales revenue ........ Variable manufacturing expense. Fixed manufacturing expense. Variable selling and administrative expense....... Fixed selling and administrative expense. Net operating income.... 580,000 $2.842,000 $1,653,000 $784,000 $145,000 $128,000 $132,000 What is the company's unit contribution margin? A. $3.10 per unit B. $1.80 per unit C. $0.23 per unit D. $4.90 per unit