Mighty Muffler, Inc. operates an automobile service facilitate that specializes in replacing mufflers on compact cars. the following table shows the cost incurred during a month when 600 mufflers were replaced.

Muffler Replacements

500 600 700

Total Cost:

Fixed cost.......................................................................................................................................a $42,000 b

Variable cost................................................................................................................................... c 30,000 d

Total Cost.........................................................................................................................................e 72,000 f

Cost per muffler replacement

Fixed cost..........................................................................................................................................g h i

Variable cost.......................................................................................................................................j k l

Total cost per muffler replacement......................................................................................................m n o

Required:

Filled in the missing amount, labeld (a) through (o) . in the table