Prepare the required adjusting journal entry at December 31, 2016, the end of the annual
accounting period for the three items below. Assume that no adjusting entries have been
made during the year. If no entry is required, explain why.
A. Polk Company acquired a patent that cost $6,000 on January 1, 2016. The patent was
registered on January 1, 2012. The useful life of a patent is 20 years from registration.
B. Polk Company acquired a gravel pit on January 1, 2016, that cost $24,000. The company
estimates that 30,000 tons of gravel can be extracted economically. When all the gravel has
been extracted, no residual value is anticipated. During 2016, 4,000 tons were extracted and
sold.
C. On January 1, 2016, Polk Company acquired a used dump truck that cost $6,000 to use
hauling gravel. The company estimated a residual value of 10% of cost and a useful life 4
years. The company uses straight-line depreciation.