In January 2014, the Jennifer Corporation purchased a patent for $231,000 from Travis Company that had a remaining legal life of 14 years. Jennifer estimated that the remaining economic life would be seven years. In January 2018, the company incurred $30,000 in legal costs to defend the patent from an infringement. Jennifer's lawyers were successful, and the remaining years of benefit from the patent were estimated to be six years. What is the patent amortization expense for 2018