The following data have been extracted from the records of Puzzle Inc.: Production level, in units Variable costs Fixed costs Mixed costs Total costs February 8,600 $18,920 ? 20,170 $74,290 August 19,780 $ ? 35,200 ? $115,097 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 13,072 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. Required A Required B Required C Required D