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O 0 B 60+60=120 9 +12=21 6 V, 192 72 E 60+ 60=120 16 10+121/,=221/, 12+15 =27 14+17*/,=31Vt 16+20 =36 6 216 96 4X24 240 10x24 Variant 3: Productivity of labour embodied in each case: when, how, under what particular commodity in any branch.