Lockard Company purchased machinery on January 1, 2012, for $82,400. The machinery is estimated to have a salvage value of $8,240 after a useful life of 8 years. (a) Compute 2012 depreciation expense using the straight-line method. (b) Compute 2012 depreciation expense using the straight-line method assuming the machinery was purchased on September 1, 2012. (a) Depreciation expense $ (b) Depreciation expense $