In business, variable costs are best defined as . Group of answer choices the amount of money spent over a given period of time expenditures in PP&E such as factories and automation costs not tied directly to the cost of producing a unit such as administration, salespeople, and managers expenses that are tied to the sale of each unit of inventory (also known as Cost of Goods Sold) costs and expenses of the company that fluctuate from year-to-year none of the above