Information concerning a product produced by Ender Company appears here: Sales price per unit Varaole cost per unit 157 80 points Total annual ixed manufacturing and operating $485,100 Required Determine the following o. Contribution margin per unit Book per unit References 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 $154,000 d. Determine the margin of safety in units, sales dollars, and as a percentage. (Round "Percentage" answer to 1 decimal place (.e. 0.234 should be entered as 23.4).) Margin of safety