【正确答案】
【答案解析】(a) Annual depreciation expense = ($200,000 -$20,000)/5=36,000
Annual depreciation expense for each year equals with each other.
(b) Double-declining-balance rate = Straight-line rate×2 = 40%
depreciation expense for year 2003 = $200,000×40% = $80,000
depreciation expense for year 2004 = $120,000×40% = $48,000
depreciation expense for year 2005 = $72,000×40% = $28,800
depreciation expense for year 2006 = $43,200×40% = $17,280
depreciation expense for year 2007 = $25,920 -$20,000 = $5,920
(c) Sum of the year's digits = 1+2+3+4+5= 15
depreciation expense for year 2003 = ($200,000-$20,000)×5/15 = $60,000
depreciation expense for year 2004 = ($200,000-$20,000)×4/15 = $48,000
depreciation expense for year 2005 = ($200,000-$20,000)×3/15 = $36,000
depreciation expense for year 2006 = ($200,000-$20,000)×2/15 = $24,000
depreciation expense for year 2007 = ($200,000-$20,000)×5/15 = $12,000