Monthly sales in units Cost of food sold $,000 8,000 10,000 Wages and fringe benefits 4,200 4,320 4,400 Fees paid delivery help 1,100 1,760 2,200 Rent on building 1,100 1,100 1,100 Depreciation on equipment 900 900 900 Utilities 800 920 1,000 Supplies (soap, floor wax, etc.) 250 340 400 Administrative costs 1,700 1,700 1,700 Total $20,050 $27,040 $31,700 (a) Identify each cost as being variable, fixed, or mixed. Cost of food sold Wages and fringe benefits <=> Fees paid delivery help Rent on building Depreciation on equipment Utilities -: Supplies (soap, floor wax, etc.) <=> Administrative costs