Gasson Company is a merchandising firm. Next month, the company expects to sell 800 units. The following data describe the company's revenue and cost structure: Selling price per unit Sales commission Purchase cost per unit Advertising expense Administrative expense $45 5% $18 $4,000 per month $4,500 per month plus 15% of sales dollars Assume that all activity mentioned in this problem is within the relevant range. What is the expected total contribution margin next month? $