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Explanation:
Skilled half skilled un-skilled
efficiency1\3 : 1\4 :1\6
efficiency4 : 3 : 2
skilled halfskilled unskilled
No. of days worked =7
8
10
work done = (7×4)+(8×3)+(10X2) = 72
Trained labourer gets :28\72 ×369=143.50