Check my work Information concerning a product produced by Ender Company appears here Sales price per unit Variable cost per unit Total annual fixed 172 89 manufacturing and operating $581,000 costs Required Determine the following a. Contribution margin per unit. $ 83 margin unit b. Number of units that Ender must sell to break even Break-even in7,000 nits c. Sales level in units that Ender must reach to earn a profit of $157,700 Sales in nits d. Determine the margin of safety in units, sales dollars, and as a percentage. (Round "Percentage" answer to 1 decimal place (i.e., 0.234 should be entered as 23.4).) Units Sales Percentage Margin of safet