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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 (meals served): REQUIRED a. Identify each cost as being variable, fixed, or mixed. b. Use the high-low method to develop a schedule identifying the amount of each cost that is mixed or variable per unit. Total the amounts under each category to develop an equation for total monthly costs. c. Predict total costs for a monthly sales volume of 8,500 units