During the construction of a highway bypass, earth moving equipment costing P400,000 was purchased for use in transporting fill from the borrow pit. At the end of the 4-year project, the equipment will be sold for P200,000. The schedule for moving fill calls for a total of 100,000 cubic feet during the project. In the first year, 40% of the total fill is required; in the second year, 30%; in the third year 25%; and in the final year, the remaining 5%. Determine the service-output depreciation schedule.