Refer to Table 5. For the basic solution (x₁, x₂, s₁, s₂, s₃) = (36, 0, 36, 9, 0) in row 7 of Table 5, classify the variables as basic or nonbasic.

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Table 5 The Table Method X1 0 0 0 0 72 45 36 18 24 27 X2 0 12 15 24 0 0 0 9 8 6 $1 72 0 -18 -72 0 27 36 0 0 $2 45 9 0 -27 -27 0 9 0 -3 0 $3 72 36 27 0 -72 -18 0 9 0 0 P = 40x₁ + 50x₂ 0 600 iii 1,440 1,170 1,380