Which of the following is true of a variable cost? A variable cost in total remains constant regardless of the level of output.. A variable cost is a cost that is not linked to a company's output. A variable cost in total changes in direct proportion to changes in output within the relevant range. A variable cost in total increases as output decreases and decreases as output increases. For the following formula, identify the dependent variable: Total Cost = Total Fixed Cost + (Variable Rate x Amount of Output) Total Cost Variable Rate Amount of Output Total Fixed Cost