The following data have been extracted from the records of Puzzle Incorporated:

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 $12,320$ 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 D

Calculate the missing costs.

Note: Do not round intermediate calculations.