Affinity makes a single product, pool pumps. Information for 2020 appears below: Sales in units Production in units Beginning inventory Variable production cost per unit Variable selling cost per unit Fixed production cost per year Fixed selling and administrative cost per year Selling price per unit 5,800 6,200 1,500 $46.00 $6.00 $31,000 $24,000 $75.00 How much is the contribution margin per unit of inventory? O $24.00 O $29.00 $23.00 $18.00