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6 2+2V5=4!/s 2*/n 12 21./* 6 120% C 1 2l/t+ 2l/j=5 1 6 2+f =3 4 12 1 D 1 6 V,+ Il/4=13/. 4 7 v„ 1 1 of department I) three-quarters of the price of labour is constant, although the unpaid labour is materialised in.