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 $ 168 $ 90 $475,800 Required Determine the following a. Contribution margin per unit b. Number of units that Ender must sell to break even. c. Sales level in units that Ender must reach to earn a profit of $156,000. d. Determine the margin of safety in units, sales dollars, and as a percentage. Complete this question by entering your answers in the tabs below. Req A to C Req D a. Contribution margin per unit. b. Number of units that Ender must sell to break even. c. Sales level in units that Ender must reach to earn a profit of $156,000. per unit a. Contribution margin b. Break-even in units . Sales in units Reg D > Complete this question by entering your answers in the tabs below. Regata Determine the margin of salety in units, sales dollars, and as a percentage. Roundercentage anwerto delle 234 should be entered as 23.4) Units Sales Purcentage Margint of sale