Gibson Guitars & Instruments, the current owner of Epiphone, one of the best guitar brands, is a leading producer of quality instruments based on their molds and designs. They have contracts with instrument manufacturers for an average cost of 3,520 and then sell them to retail companies for an average price of 5,950. During the month, Gibson Guitars & Instruments sold 80 Epiphones. The companys selling, general, and administrative (SG&A) costs related to the product line are presented below:

	Selling:
	Advertising	3,000 per month
	Sales salaries and commissions	7,500 per month, plus 12.5% of sales
	Delivery costs to customers	250 per instrument sold
	Utilities	2,000 per month
	Depreciation of sales facilities	300 per month
	General & Administrative:
	Staff salaries	25,000 per month
	Insurance	2,000 per month
	Clerical	150 per month, plus 50 per instrument sold
	Depreciation of office equipment	120 per month

____________ is the amount of total fixed costs.

____________ is the amount of total variable costs.

____________ is the amount of net operating income.

____________ is the amount of gross margin.