Exercise 11-19 Margin of safety LO 11-6 Information concerning a product produced by Ender Company appears here Sales price per unit Variable cost per unit Total annual fixed manufacturing and operating costs $ 166 S 88 $475,800 Required Determine the following a. Contribution margin per unit Contribution margin per unit b. Number of units that Ender must sell to break even eak-even in units c. Sales level in units that Ender must reach to earn a profit of $210,600 ales in units