Fields Laboratories holds a valuable patent (No. 758-6002-1A) on a precipitator that prevents certain types of air pollution. Fields does not manufacture or sell the products and processes it develops. Instead, it conducts research and develops products and processes that it patents, and then assigns the patents to manufacturers on a royalty basis. Occasionally it sells one of its patents. The history of Fields patent number 758-6002-1A is as follows.

2011 2012		Research conducted to develop precipitator		$390,000
Jan. 3, 2013		Design and construction of a prototype (capitalization criteria not yet met)		88,200
Mar. 15, 2013		Testing of models		41,200
Jan. 4, 2014		Fees paid to engineers and lawyers to prepare patent application; patent granted January 4, 2014		56,300
Nov. 30, 2015		Engineering activity necessary to advance the design of the precipitator to the manufacturing stage		82,000
Dec. 31, 2016		Legal fees paid to successfully defend precipitator patent		42,000
Apr. 15, 2017		Research aimed at modifying the design of the patented precipitator		43,000
July 31, 2021		Legal fees paid in unsuccessful patent infringement suit against a competitor		32,500

a) Calculate the carrying value of patent No. 758-6002-1A on December 31, 2014.

b) Calculate the carrying value of patent No. 758-6002-1A on December 31, 2018.

c) Calculate the carrying value of patent No. 758-6002-1A on December 31, 2021.