Brief Exercise 11-2 Sandhill Company purchased machinery on January 1, 2017, for $91,200. The machinery is estimated to have a salvage value of $9,120 after a useful life of 8 years. Compute 2017 depreciation expense using the straight-line method. Depreciation expense $ Compute 2017 depreciation expense using the straight-line method assuming the machinery was purchased on September 1, 2017. Depreciation expense $