Listed here are four series of separate costs measured at various volume levels. Volume (Units) 500 1,000 1,500 2,000 2,500 3,000 Series 1 $5,000 5,000 5,000 10,000 10,000 15,000 15,000 Series 2 $ 6,000 18,500 31,000 43,500 56,000 68,500 81,000 Series 3 Series 4 $5,000 15,000 5,000 30,000 5,000 45,000 5,000 60,000 5,000 75,000 5,000 90,000 5,000 uoming anah carioc and identifichathatatL... 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. Series 1 Series 2 Series 3 1 Series 4 1