Schillig & Gray Industries purchased a new machine at the beginning of 2011 for $ 9,500. The company expected the machine to last for four years and have a salvage value of $500. The productive life of the machine was estimated to be 180,000 units. Yearly production was as follows: in 201 t produced 50,000 units; in 2012 it produced 45,000 units; in 2013 it produced 30,000 units; and in 2014 it produced 55,000 units. a. Complete the depreciation schedule using the straight-line method. (Round your answers to the nearest dollar.) Cost of Depreciation Acc. Dep. Book Value Equipment Year 2011 S 2012 2013 2014 Expense End of Year End of Year 9,500 9.500 9.500 9,500 b. Complete the depreciation schedule using the double-declining balance method. (Round your answers to the nearest dollar.) Cost of Depreciation Acc. Dep. Expense Book Value Year 2011 S 2012 2013 2014 Equipment End of Year End of Year 9,500 9,500 9,500 9,500 c. Complete the depreciation schedule using the activity method. (Round your answers to the nearest dollar.) Acc. Dep End of Year Cost of Depreciation Book Value End of Year Year Equipment 2011 S 2012 2013 2014 Expense 9,500 9,500 9,500 9.500