Information concerning a product produced by Ender Company appears here: 171 Sales price per unit Variable cost per unit Total annual Fixed manufacturing and operating $ 5 $544,000 Requlred 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 $229.500. d. Determine the margin of safety in units, sales dollars, and as a percentage