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