Answer:
a. Debit Depreciation expense $13,250
 Credit Accumulated depreciation $13,250
 Being entries to record depreciation expense
b. Debit Depreciation expense $26,500
 Credit Accumulated depreciation $26,500
 Being entries to record depreciation expense
c.  Debit Depreciation expense $13,250
 Credit Accumulated depreciation $13,250
 Being entries to record depreciation expense
Step-by-step explanation:
Depreciation is the systematic allocation of the cost of an asset to the income statement over the estimated useful life of that asset. 
It is determined as the depreciable value of the asset over the estimated useful life of the asset where the depreciable value is the difference between the cost and salvage value of the asset 
Mathematically, 
Annual Depreciation = (Cost - Salvage value)/Estimated useful life 
= ($228,000 - $16,000)/8
= $26,500
First year depreciation is for 6 months, this is
= $26,500/2
= $13,250
Depreciation expense for the last year would also be for 6 months only