Following are five series of costs A through E measured at various volume levels. Examine each series and identify which is fixed, variable, mixed, step-wise, orcurvilinear.

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Volume (Units) Series A Series B $2,500 3,100 3,700 4,300 4,900 5,500 6,100 Series C 0 3,600 7.200 10,800 14,400 18,000 21,600 Series D $2,000 2,000 4,000 4,000 6,000 6,000 8,000 Series E $4,000 4,000 4,000 4,000 4,000 4,000 4,000 0 0 200 400 600 一800 1,000 1,200 6,000 6,600 7,200 8,200 9,600 13,500