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Within the relevant range, variable costs can be expected to: Multiple Choice remain constant in total as the activity level changes. increase on a per unit basis as the activity level increases. vary in total in direct proportion to changes in the activity level. increase on a per unit basis as the activity level decreases. In the standard cost formula Y = a +bX, what does the "X" represent? Multiple Choice total fixed cost O total cost variable cost per unit the level of activity Which is NOT an advantage of a "Lean Production" management approach? Multiple Choice O Less wasted effort Quicker customer response times Maximizing inventory levels Fewer defects