The following data have been extracted from the records of Puzzle Incorporated: February August Production level, in units 11,400 23,940 Variable costs $ 27,360 $ ?question mark Fixed costs ?question mark 35,200 Mixed costs 26,166 ?question mark Total costs $ 88,726 $ 140,015 Required: Calculate the missing costs. Calculate the cost formula for mixed cost using the highlow method. Calculate the total cost that would be incurred for the production of 15,258 units. Identify the two key cost behavior assumptions made in the calculation of your answer to part c