5.36 Contribution margin, unit level costs (LO1). Bodacious Beats makes high-end head- phones. At a volume of 15,000 units (headphones), per-unit price and cost data for the year just ended follow: Item Amount per unit Selling price $800 Variable manufacturing costs 440 Fixed manufacturing overhead 50 Gross margin $310 Variable selling costs 40 Fixed selling and administrative costs 110 Profit $160 Required How many units (headphones) does Bodacious Beats need to sell each year to break even