Machinery was purchased on September 6, 2017 for $500,000. It is expected to have a useful life of 4 years, or 16,000 operating hours, and a residual value of $20,000. The machinery was used for 1,500 hours in 2017, 3,000 hours in 2018, 3,500 hours in 2019,3.750 hours in 2020 and 4,250 hours in 2021. Determine the amount of depreciation expense for each of the years below. Directions: Enter in the annual depreciation amounts for the methods listed below. Round all answers to the nearest whole dollar, no decimals; use commas, but do not use dollar signs. Straight Line: 2017 2018 2019 2020 2021 Units of Activity: 2017 2018 2019 2020 2021 Double-Declining Balance 2017 2018 2019 2020 2021 Double-Declining Balance 2017 2018 2019 2020 2021