52.
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

54.
Assertion (A): Activity 57 is critical.
Reason (R): Earliest finish time and latest finish time for events 57 are same

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