Information concerning a product produced by Gibson Company appears as follows: Sales price per unit Variable cost per unit Total annual fixed manufacturing and operating costs $ 171 S87 $520,800 Required Determine the following: a. Contribution margin per unit. b. Number of units that Gibson must sell to break even. c. Sales level in units that Gibson must reach to earn a profit of $184,800. a. Contribution margin per unit b. Break-even in units c. Required sales in units