On January 1, 2016, Sally, Inc. bought a patent for $100,000. There were ten years left of the patent's legal life. On July 1, 2018, the company successfully defended the patent in court at a cost of $30,000.

Required:

Compute the amount of patent amortization expense for 2018. Assume Sally calculates amortization to the nearest month and uses the straight-line method.