A tractor whose weight is 20 tonnes has a drawbar pull of 2500 kg, when operated on a level road having a rolling resistence of 30 kg per tonne. If this tractor is operated on a level road having a rolling resistance of 40 kg per tonne, then the drawbar pull of the tractor will________________?
(A) reduce by 200 kg
(B) increase by 200 kg
(C) increase by 250 kg
(D) reduce by 250 kg
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