Please answer part (c). Please show all your work. I need to fully understand how to work the problem.

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QUESTION 2 Partially correct Mark 26.00 out of 27.00 Flag question Cost Behavior Analysis in a Restaurant: High-Low Cost Estimation Assume a Potbelly's restaurant has the following information available regarding costs at representative levels of monthly sales Monthly sales in units 5,000 8,000 10,000 10,000 $16,000 20,000 4,200 4,320 4,400 1,100 ,760 2,200 1,100 ,100 1,100 900 920 1,000 Supplies (soap, floor wax, etc 250 340 400 1,700 ,700 1,700 $ 20,050 $27,040 $31,700 Cost of food sold Wages and fringe benefits Fees paid delivery help ent on building Depreciation on equipment Utilities 900 900 800 Administrative costs Total