Tolden Marketing, Inc., a merchandising company, reported sales of $2, 861, 800 and cost of goods sold of $1, 492, 400 for December. The company's total variable selling expense was $77, 900; its total fixed selling expense was $70, 600; its total variable administrative expense was $98, 400; and its total fixed administrative expense was $193, 400. The cost of goods sold in this company is a variable cost. The contribution margin for December is: 1, 369, 400 2, 421, 500 1, 193, 100 929, 100 Ence Sales, Inc., a merchandising company, reported sales of 6, 400 units in April at a selling price of $684 per unit. Cost of goods sold, which is a variable cost, was $455 per unit. Variable selling expenses were $30 per unit and variable administrative expenses were $40 per unit. The total fixed selling expenses were $156, 800 and the total administrative expenses were $260, 400. The gross margin for April was 1, 465, 600 3, 960, 400 1, 017, 600 600, 400