Dade purchased a patent on January 1, 2003 for $120,000. The patent had a remaining useful life of 10 years at that date. In January 2004, Dade successfully defends the patent at a cost of $54,000, extending the patent's life is 12/31/15.
a.)$12,000
b.)$13,500
c.)$14,500
d.)$18,000