I dont understand hwo to dind the missing variable and mixed costs

The following data have been extracted from the records of Puzzle Incorporated: Required: a. Calculate the missing costs. b. Calculate the cost formula for mixed cost using the high-low method. c. Calculate the total cost that would be incurred for the production of 16,600 units. d. Identify the two key cost behavior assumptions made in the calculation of your answer to part c. Complete this question by entering your answers in the tabs below. Calculate the missing costs. Note: Do not round intermediate calculations. Calculate the cost formula for mixed cost using the high-low method. Note: Do not round intermediate calculations. Round "Variable rate" to 2 decimal places Calculate the total cost that would be incurred for the production of 20,060 units. Note: Do not round intermediate calculations. Identify the two key cost behavior assumptions made in the calculation of your answer to part c