A variable cost is a cost that A) varies per unit at every level of activity. B) occurs at various times during the year. C) various in total in proportion to changes in the level of activity. D) may or may not be incurred, depending on management's discretion. Fixed normally will not include A) property taxes. B) direct labor. C) supervisory salaries. D) depreciation on buildings and equipment. Portman Company's activity for the first three months of 2016 are as follows: Using the high-low method, how much is the cost per machine hour? A) $2.00 B) $3.00 C) $2.26 D) $1.78 Hollis Industries produces flash drives for computers, which it sells for $20 each flash drive costs $13 of variable costs to make. During April, 1.000 drives were Fixed costs for March were $2 per unit for a total of $1,000 for the month How the contribution margin ratio? A) 25% B) 35% C) 65% D) 75%