The following data have been extracted from the records of Puzzle Incorporated: August Production level, in units Variable costs Fixed costs Mixed costs Total costs Required: February 11,300 $ 25,990 24,860 $? 37,400 ? ? 21, 203 $ 84,593 $ 133,545 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 15,820 units. d. Identify the two key cost behavior assumptions made in the calculation of your answer to part c.