Sunny Corporation reported the following results for December: Description Amount Number of units sold 800 units Selling price per unit $500 per unit Cost of goods sold per unit (all variable) $250 per unit Variable selling expense per unit $45 per unit Fixed selling expense $22,100 Variable administrative expense per unit $32 per unit Fixed administrative expense $15,400 The contribution margin for December is: A. $138.400 B. $200,000 @c. $338,400 D. $162,500 Moving to another question will save this response