=+Determine the amount of depreciation expense for the years ended December 31, 2009, 2010, 2011, and 2012, by

(a) the straight-line method,

(b) the units-of-production method, and

(c) the double-declining-balance method. Also determine the total depreciation expense for the four years by each method. The following columnar headings are suggested for recording the depreciation expense amounts:

Depreciation Expense