The following data relate to the Plant Assets account of Keller Inc. at December 31, 2016:

In the year an asset is purchased, Keller does not record any depreciation expense on the asset. In the year an asset is retired or traded in, Keller takes a full year's depreciation on the asset.
The following transactions occurred during 2017:
1. On May 5, Asset A was sold for $16,500 cash. The company's bookkeeper recorded this retirement as follows:
Cash .................................................. 16,500
Asset A ........................................................... 16,500
2. On December 31, it was determined that Asset B had been used 3,200 hours during 2017.
3. On December 31, before calculating depreciation expense on Asset C, Keller management decided that Asset C's remaining useful life should be nine years as of year-end.
4. On December 31, it was discovered that a piece of equipment purchased in 2016 had been expensed completely in that year. The asset cost $31,000, had a useful life of 10 years when it was acquired, and had no residual value. Management has decided to use the double-declining-balance method for this asset, which can be referred to as "Asset E." Ignore income taxes.
Instructions
(a) Prepare any necessary adjusting journal entries required at December 31, 2017, as well as any entries to record depreciation for 2017.
(b) As an owner of Keller Inc., do you have any concerns with respect to the bookkeeper's work?

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Original cost Year purchased Useful life Residual value Depreciation method Accumulated depreciation through 2016 $46,000 2011 10 years $3,900 straight-line $21,050 $58,000 2012 17,000 hours $4,450 activity $31,600 $68,000 2013 15 years $8,000 straight-line $12,000 $73,000 2014 10 years $4,700 double-declining $26,280