In 2017, Xenex Market Services began development of a customer management software package for their own internal use and incurred $40,000 costs related to conceptual formulation of design alternatives. In 2018, management agreed to fully fund development of the software and spent $120,000 in development costs. In 2019, development was completed after incurring an additional $160,000 in development costs plus another $ 60,000 was spent on training costs for using the software. In 2020, the company started using the software and began amortizing related costs over a 10-year expected useful life. What is the amount of amortization expense for 2020 for this internally-developed software