Current Attempt in Progress Pina Laboratories holds a valuable patent (No. 758-6002-1A) on a precipitator that prevents certain types of air pollution. Pina 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 Pina patent number 758-6002-1A is as follows. Date Activity Cost 2011-2012 Research conducted to develop precipitator $370,000 Jan. 2013 Design and construction of a prototype 88,000 Testing of models 70,000 March 2013 Jan. 2014 Fees pald engineers and lawyers to prepare patent application; patent granted June 30, 2014 68,000 Nov. 2015 Engineering activity necessary to advance the design of the precipitator to the manufacturing stage Dec 2016 Legal fees paid to successfully defend precipitator patent 95,000 70,000 71,000 April 2017 Research aimed at modifying the design of the patented precipitator July 2021 Legal fees paid in unsuccessful patent infringement suit against a competitor 35,000 July 2021 Legal Tees paid in unsuccessful patent infringement suit against a competitor 35,000 Pina 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 your 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 $