Which of the following is not an assumption about the data when using CVP analysis? Total fixed costs remain at a constant level and variable costs per unit remain unchanged at all sales levels. All costs can be easily and accurately separated into fixed and variable components. More inventory is purchased than sold. A linear relationship exists between variable costs and sales activity over the relevant range of interest. Which of the following is not an assumption about the data when using CVP analysis? Total fixed costs remain at a constant level and variable costs per unit remain unchanged at all sales levels. All costs can be easily and accurately separated into fixed and variable components. More inventory is purchased than sold. A linear relationship exists between variable costs and sales activity over the relevant range of interest