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 900 mufflers were replaced. (Round "cost per muffler" to 2 decimal places.) Number of Muffler Replacements 800 900 1000 Total costs: Fixed costs Variable costs $ 87,300 51,300 $ 138,600 Total costs Cost per muffler replacement: Fixed cost Variable cost Total cost per muffler replacement