4. Spooktacular, Inc, a merchandising company, reported sales of 7,100 units in September at a selling price of $682 per unit. Cost of goods sold, which is a variable cost, was $317 per unit. Variable selling expenses were $44 per unit and variable administrative expenses were $22 per unit. The total fixed selling expenses were $157.200 and the total administrative expenses were $338,000. The total contribution margin for September was: A. $1,783,900 B. $2,122,900 C. $1,627,700 D. $2,279,100