What is a specific,"real-life", example of a (just one!) specific business firm in the state of Washington who incurs a variable cost each month?

And the first paragraph of your posting should specifically identify (just) one good or servicethat is sold by the businessthat you are describing (by name), and also describe one specific location in the state of Washington where they currently sell their product.

Then - in at least two more paragraphs - discuss how the cost example you have chosen could also be used as an example of a marginal cost in the short run for your specific business firm. To earn the most points, your sentences should demonstrate your own understanding of the definitions of fixed, variable, and marginal cost