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A patent was purchased on 1/1/2016 for 150,000 with 15 years useful life On 1/1/2017 the company paid legal defense fees of 89,000.on 1/1/2018 the management decided to impair the patent they expected the future net cash flow 70,000 and fair value 108,000 required calculate the amortization expense for the years: 2016,2017,2018,2019