View Policies Current Attempt in Progress In using the high-low method, the fixed cost O is determined by adding the total variable cost to the total cost at the low activity level. is determined by subtracting the total cost at the high level of activity from the total cost at the low activit O may be determined by subtracting the total variable cost from either the total cost at the low or high activ O is determined before the total variable cost. Save for Later Attempts: 0 of 1 use