On January 1, 2014, Forge Mill Company bought a hydraulic hammering machine. The cost of the machine was $41,000. Its estimated residual value was $10,000 at the end of an estimated 10-year life. The company expects to produce a total of 20,000 units. a. Calculate depreciation expense for 2014 and 2015 using the straight-line method. 2014 2015 Depreciation Expense b. Calculate depreciation expense for 2014 and 2015 using the double-declining balance method. 2014 2015 Depreciation Expense c. Calculate the depreciation expense for 2014 and 2015 using the units-of-production method. The company produced 1,500 units in 2014 and 1,950 units in 2015. (Round your final answer to nearest dollar value.) 2014 2015 Depreciation Expense