Using the high-low method to calculate fixed and variable costs, we have calculated our fixed costs to be $10,000 and our variable cost per unit to be $6.00. These calculations were based on a low activity level of 450 and a high activity level of 800. What is the equation for the line that most closely represents total cost at an activity level of 600? Multiple Choice O Total Cost = $10,000 - ($6.00 x 600) Total Cost = $10,000 + ($6.00 x 600) Total Cost = $10,000 + ($6.00 x 350) Total Cost = $10,000 + ($6.00 x 800)