Question 7 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 gross margin for December is: $138,400 A O B. $200,000 $338,400 D.5162,500 0