On January 1,2011, Zane Manufacturing Company purchased a machine for $40,000. The company expects to use the machine a total of 24,000 hours over the next 6 years. The estimated sales price of the machine at the end of 6 years is $4,000. The company used the machine 8,000 hours in 2011 and 12,000 in 2012 What is depreciation expense for 2011 if the company uses double-declining balance depreciation? What is depreciation expense for 2012 if the company uses double-declining balance depreciation? What is the book value of the machine at the end of 2012 if the company uses double-declining balance depreciation? What is depreciation expense for 2011 if the company uses straight-line depreciation? What is depreciation expense for 2012 if the company uses straight-line depreciation? What is the book value of the machine at the end of 2012 if the company uses straight-line depreciation? What is depreciation expense for 2011 if the company uses units-of-production depreciation? What is depreciation expense for 2012 if the company uses units-of-production depreciation? What is the book value of the machine at the end of 2012 if the com pany uses units-of-production depreciation