Sheffield Laboratories holds a valuable patent (No. 758-6002-1A) on a precipitator that prevents certain types of air pollution. Sheffield does not manufacture or sell the products and processes it develops. Instead, it conducts research and develops products and processes which it patents, and then assigns the patents to manufacturers on a royalty basis. Occasionally it sells a patent. The history of Sheffield patent number 758-6002-1A is as follows. Date Activity Cost 2011-2012 $380,000 Jan. 2013 Research conducted to develop precipitator Design and construction of a prototype Testing of models 89,000 March 2013 58,800 Jan. 2014 64,600 Nov. 2015 Fees paid engineers and lawyers to prepare patent application; patent granted June 30, 2014 Engineering activity necessary to advance the design of the precipitator to the manufacturing stage Legal fees paid to successfully defend precipitator patent Research aimed at modifying the design of the patented precipitator Legal fees paid in unsuccessful patent infringement suit against a 90,500 Dec. 2016 58,800 April 2017 59,800 July 2021 competitor 35,000 Sheffield assumed a useful life of 17 years when it received the initial precipitator patent. On January 1, 2019, it revised its useful life estimate downward to 5 remaining years. Amortization is computed for a full year if the cost is incurred prior to July 1, and no amortization for the year if the cost is incurred after June 30. The company's year ends December 31. Compute the carrying value of patent No. 758-6002-1A on each of the following dates: (a) December 31, 2014 $ (b) December 31, 2018 $ (c) December 31, 2021 $ GA