Mighty Muffler, Inc., operates an automobile service facility that specializes in replacing mufflers on compact cars. The following table shows the costs incurred during a month when 600 mufflers were replaced. Required: Fill in the missing amounts. Total costs: Fixed costs Variable costs Total costs Cost per muffler replacement: Fixed cost Variable cost Total cost per muffler replacement Muffler Replacements 500 600 700 $ 42,000 30,000 $ 72,000