Apply the high-low method of cost analysis to the three cost data groups shown below.

Volume (applicable to each group)	Group A Costs	Group B Costs	Group C Costs
2,000	$3,900	$1,500	$3,600
12,000	18,900	9,000	3,600
16,000	24,900	12,000	3,600
20,000	30,900	15,000	3,600

What cost behavior patterns are apparent? Express each as a cost formula: Total cost = Fixed costs + (Variable cost x Volume).

Group	Fixed costs	+	(Variable cost	x Volume)
A	Answer	+	Answer	x Volume
B	Answer	+	Answer	x Volume
C	Answer	+	Answer	x Volume