A four-wheel tractor whose operating weight is 15,000 kg is pulled along a level haul road at a uniform speed by another tractor. The average tension in the toe cable is 675 kg. The rolling resistance of the haul road is

An equipment costs Rs.25000 to purchase now. It will be used continuously for 8 years. At the end, its salvage value is estimated to be Rs.1600. Its residual book value at beginning of the 6th year of its use, by the straight line method of depreciation is

A nursery has 5000 plants. 5% of the plants are roses and 1% is marigold. What is the total number of other plants?