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. (Round "cost per muffler" to 2 decimal places.) Number of Muffler Replacements 500 600 700 $ 56,400 32,400 88,800 Total costs: Fixed costs Variable costs Total costs Cost per muffler replacement Fixed cost Variable cost Total cost per muffler replacement