help please

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 $ 150 Direct labor 180 Variable factory overhead 90 Fixed production costs: Depreciation (equipment) 50 Factory rent 78 Other 18 Total production cost $ 566 Variable selling & administrative costs $ 30 per unit Fixed selling & administrative costs $ 42 per unit Given a normal selling price per unit of $780, what is the contribution margin per unit sold for recurring (i.e., normal) sales? Multiple Choice O $426. O $406. O $366. $330. $630