question 4: Cost structure estimation mountProed or varlable? Cost account direct labor direct materials depreciation rent administrative staff salaries $6,000 $6,000 $9,000 $7,000 $6,000 OF OV OF OV OF OV OF OV OF OV Production volume was 200 units. a) Which cost structure estimation method should we use? O account classification method O high-low method b) Classify each cost account above as fixed or variable. Enter your answers in the table above. c) Estimate the cost structure parameters: total FC=$ unit VC- $ Write down the total cost equation: (e.g., if TC-500+2"volume, enter 500 in the first box and 2 in the second box) d) Predict the total cost of producing 250 units: * volume