5. January 2, 2015, Koll, Inc. purchased a patent for a new consumer product for $800,000. At the time of purchase, the patent was valid for 15 years; however, the patent's useful life was estimated to be only 10 years due to the competitive nature of the product. On December 31, 2018, the product was permanently withdrawn from the market under governmental order because of a potential health hazard in the product. What amount should Koll charge against income during 2018, assuming amortization is recorded at the end of each year?