Compute the 2020 amortization and the 12/31/20 book value, assuming that at the beginning of 2020 , Sheffield determines that the trade name will provide no future benefits beyond December 31,2023. 2020 amortization 12/31/20 book value Compute the 2020 amortization and the 12/31/20 book value, assuming that at the beginning of 2020 , Sheffield determines that the trade name will provide no future benefits beyond December 31,2023. 2020 amortization 12/31/20 book value