Construction Planning and Management
If the excavation of earth is done manually then it costs Rs. 10 per cum. A machine can excavate at a fixed cost of Rs. 4000 plus a variable cost of Rs. 2 per cum. The quantity of earth for which the cost of excavation by machine will be equal to the cost of manual excavation is

1500 cum
500 cum
1000 cum
2000 cum

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Construction Planning and Management
Free float is mainly used to

Identify the activities, which can be delayed without affecting the total float of succeeding activity
Identify the activities which can be delayed without affecting the total float of either the preceding or succeeding activities
Identify the activities which can be delayed without affecting the total float of preceding activity
Establish priorities

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