Definition A. The way in which total cost behaves or changes, when some measure of activity changes. B. The range of activity over which assumptions about cost behavior hold true. C. A cost that changes in total in direct proportion to changes in activity while the per unit cost remains constant. D. A cost that is fixed over a narrow range of activity and increases multiple times across a relevant range. E. A cost that remains the same in total regardless of the activity level. F. Both the total cost and the cost per unit change with the level of activity. G. A cost that is fixed over a wide range of activity, but increases when a capacity limit is reached. H. The expression of the relationship between total cost and activity expressed as y = a + b(x). I. A visual representation of the relationship between total cost and activity level. J. The use of the two most extreme activity points to determine the variable cost per unit. K. A measure of how well the data are represented by the formula y = a + b(x). L. The difference between sales revenue and variable costs. M. The difference between the unit sales price and the unit variable costs. N. Unit contribution margin divided by the unit sales price. O. An external reporting method that reflects both the fixed and variable manufacturing costs in cost of goods sold. P. A costing method that focuses on cost behavior. Q. An internal income statement that separates fixed and variable costs. Term