Choo Laboratories holds a valuable patent (No. 758-6002-1A) on a precipitator that prevents certain types of air pollution. Choo 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 Choo's patent number 758-6002-1A is as follows.

Based on execution of a royalty contract in March 2016, the patent is deemed to be economically viable. Choo assumed a useful life of 17 years when it received the initial precipitator patent. On January 1, 2018, 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.
Instructions
Compute the carrying value of patent No. 758-6002-1A on each of the following dates:
a. December 31, 2013.
b. December 31, 2017.
c. December 31, 2020.

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Date Activity 2010-2011 Research conducted to develop precipitator Cost HK$384,000 Design and construction of a prototype Jan. 2012 87,600 Testing of models 42,000 March 2012 Fees paid engineers and lawyers to prepare patent application; patent granted June 30, 2013 59,500 Jan. 2013 Engineering activity necessary to advance the design of the precipitator to the manufacturing stage Legal fees paid to successfully defend precipitator patent Development costs aimed at modifying the design of the patented precipitator Legal fees paid in unsuccessful patent infringement suit against a competitor Nov. 2014 81,500 Dec. 2015 April 2016 July 2018 42,000 49,000 34,000