HELP PLEASE AND THANK YOU

Following are five series of costs A through E measured at various volume levels. Identify each series as either fixed, variable, mixed step-wise, or curvilinear Volume (Unito) 0 400 000 1,200 1,600 2.000 2,400 Series $ 3,600 3,600 4.600 4.600 5.500 5,600 6,600 Series $7,600 7,600 7,600 7,600 7,600 7,600 7,600 Series o $ D 4,640 9.280 13,920 28,560 23,200 27,840 Serien $3,800 4,400 5,000 5,600 6,200 6. BOO 7,400 Series E $ 0 7.300 8,030 8,760 9,977 11,680 16,425 Serie A Series B Series C Series D Series E