Explain how mixed costs are related to both fixed and variable costs. s.. A mixed cost is the sum of fixed costs and the portion of variable costs that are related to salaries and wages. These mixed costs are discretionary costs that easily fluctuate and must therefore be kept separate during a production phase. B. Mixed costs are the sum of the fixed and variable costs that are related to equipment costs. These mixed costs are a form of committed costs during the production phase. c. Mixed costs have a fixed portion that is a cost per unit of cost driver activity. Mixed costs also have a variable portion that is usually a cost per time period. D. A mixed cost has a fixed portion that is usually a cost per time period. A mixed cost also has a variable portion that is a cost per unit of cost driver activity. What is a cost driver? Give three examples of costs and their possible cost drivers What is a cost driver? A. A cost driver is the variable costs of a product or service for a given year to determine where financial difficulties can arise B. A cost driver is the sum of a company's committed fixed costs and discretionary fixed costs over a period of time c. A cost driver is the cost of being able to achieve a desired level of production or service while maintaining the products' attributes D. A cost driver is any output measure that is believed to cause costs to fluctuate in a predictable manner