1. Mighty Muffler, Inc., operates an automobile service facility. The table below shows the cost incurred during a month when 400 mufflers were replaced Number of Muffler Replacements 100 400 1.200 Total costs: Fixed costs Variable costs Total costs $12.000 Cost per muffler replacement: Fixed cost Variable cost Total cost per muffler replacement Required: Fill in the missing amounts, labeled A through P, in the table