ow are mixed costs and step variable costs similar and different? A. Both use fixed costs the same; however step variable costs calculates variable costs as a change in production volume changes. B. Both have elements of fixed and variable costs, however step variable costs have distinct fixed and variable components and mixed c C. Both have elements of fixed and variable costs; however mixed costs have distinct fixed and variable components. Step variable cost narrow range of activity and increase only when the next step is reached. D. Both use fixed and variable costs; however mixed costs increase only when the next step is reached