Final answer:
The book value of the copyright as of December 31st, 2015 is $220,000.
Step-by-step explanation:
The book value of the copyright as of December 31st, 2015 can be determined using the straight-line amortization method. The initial cost of the copyright was $300,000 and the estimated remaining economic life is 15 years. Therefore, the annual amortization expense is $300,000 / 15 years = $20,000.
Since the fiscal year ends on December 31st, there are 4 years between April 1st, 2012 (acquisition date) and December 31st, 2015. The accumulated amortization would be $20,000/year x 4 years = $80,000.
The book value of the copyright as of December 31st, 2015 is the initial cost of the copyright minus the accumulated amortization, which is $300,000 - $80,000 = $220,000.