Calculate (A) net sales, (B) gross profit, (C) total operating expenses, and (D) net income. (Enter your answers as a whole dollar amount.) Sales returns $850, rent expense $1,355, sales discounts $1,200, depreciation expense $510, cost of merchandise sold $6,500, gross sales $19,500, advertising expense $400, salary expense $2,100, heat expense $750. A. B. C. D