Current Attempt in Progress Pronghorn A/S purchased a new machine on October 1,2020, at a cost of 110.000. The company estimated that the machine will have a residual value of 10,000. The machine is expected to be used for 10,000 working hours during its 4-year life. Your answer is correct. Calculate depreciable cost. (Round answer to 2 decimal places, eg. 12.50.) 10 per hour Depreciable cost Your answer is partially correct. Compute the depreciation expense under the following methods for the year indicated. (a) Straight-line for 2020. (b) Units-of-activity for 2020, assuming machine usage was 1,610 hours (c) Declining-balance using double the straight-linerate for 2020 and 2021. 2020 2021 6250 Straight-line method 16100 Units-of-activity method 5000000 Declining-balance method