Answer:
The book value of patents should be reported at: $336,000.
Explanation:
Under U.S GAAP, R&D is not permitted to capitalized, thus R&D expenses incurred in the period is not relevant in calculation the book value of patent. On the other hand, successful ligation costs are allowed to be capitalized.
We have the book value of patents = Book value at opening of 2020 + Cost of successful patent infringement suit at 1st December 2020 - amortization of patents in the period of the year 2020;
where: Amortization of patents in the period = 12 months of book value at opening of 2020 amortization + 1 month of Cost of successful patent infringement suit = 288,000/ ( 8 x 12) x 12 + 85,000/( 1 + 7 x 12) x 1 = 37,000 ( as amortization is distributed equally on remaining useful life ( in months))
=> The book value at the end of 2020 = 288,000 + 85,000 - 37,000 = $336,000