The following cost information pertained to the Violin Division of Stringing Music Co. and was based on monthly demand and sales of 100 units: Per-Unit Costs Variable production costs: Direct materials Direct labor Variable factory overhead $120 150 60 Fixed production costs: 20 48 12 $410 $24 per unit $36 per unit Depreciation (equipment) Factory rent Other Total production cost Variable selling & administrative costs Fixed selling & administrative costs Given a normal selling price per unit of $750, what is the contribution margin per unit sold for recurring (i.e., normal) sales? $336 O $316 $276 $396. $630