The following data have been extracted from the records of Puzzle lnc.: February August Production level, in unit5 19,999 23,993 Variable co5t5 $2-J89El $ 3' Fixed co5t5 ? 36,933 Mixed co5t5 285693 3' Total costs $89,683 $118,683 [ Required: a. Calculate the missing costs. b. Calculate the cost formula for mixed cost using the highlow method. c. Calculate the total cost that would be incurred for the production of16.000 units. d. Identify the two key cost behavior assumptions made in the calculation of your answer to part c