E White Products, a small manufacturer, has submitted the items below concerning last year's operations. The president's assistant, trying to be helpful, has prepared a list of costs and other information. Administrative salaries Advertising expense Depreciation - factory building Depreciation - factory equipment Depreciation - office equipment Direct labour cost Finished goods inventory, beginning Finished goods inventory, ending General liability insurance expense Indirect labour cost Insurance on factory Purchases on raw materials Raw materials inventory, beginning Raw materials inventory, ending Repairs and maintenance of factory Sales Sales salaries Taxes on factory Travel and entertainment expense Work-in-process inventory, beginning Work-in-process inventory, ending $9,600 $4,800 $3,200 $6,400 $720 $87,600 $187,920 $176,840 $960 $47,200 $5.600 $58.400 $8,400 $12 800 $3,600 $440,000 $8,000 $1,800 $5,640 $6,680 $4,440 Chapt. calculate gross margin