High-low method-missing amounts The following data have been extracted from the records of Puzzle Inc.: February August Production level, in 10,000 20,000 units Variable costs.... $24,000 $ ? Fixed costs... ? 36,000 Mixed costs.. 20,000 ? Total costs.. $80,000 $118,000 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 16,000 units. d. Identify the two key cost behavior assumptions made in the calculation of your answer to part c.