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_________________?
(A) 500 cum
(B) 1000 cum
(C) 1500 cum
(D) 2000 cum
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