In January, 2013, Ivanhoe Corporation purchased a patent for a new consumer product for $966000. At the time of purchase, the patent was valid for 15 years. Due to the competitive nature of the product, however, the patent was estimated to have a useful life of only 10 years. During 2018 the product was determined to be obsolete due to a competitors new product. What amount should Ivanhoe charge to expense during 2018, assuming amortization is recorded at the end of each year?

$644,000

$483,000

$96,600

$64,400