3. A machine cost $500,000 on April 1, 2019. Its estimated salvage value is $50,000 and its expected life is eight years or 100.000 hours. Calculate the depreciation expense (to the nearest dollar) using each of the following methods: (3 points) (a) Straight line for 2019 and 2020 2019: 500,000 - 50,000 100,000 nas 2019 : 4.5hrs x syrs (b) Double-declining balance for 2019 and 2020 (e) Units of activity for 2019 and 2020 assuming actual hours of 12,000 and 17,000 respectively