QS 21-1 Cost behavior identification LO C1

Listed here are four series of separate costs measured at various volume levels.

Volume (Units)			Series 1			Series 2			Series 3			Series 4
	0		$	450		$	0		$	800		$	100
	100			450			800			800			105
	200			450			1,600			800			120
	300			450			2,400			1,600			145
	400			450			3,200			1,600			190
	500			450			4,000			2,400			250
	600			450			4,800			2,400			320

Examine each series and identify whether it is best described as a fixed, variable, step-wise, or curvilinear cost. It can help to graph the cost series.