4. (2 points) Knox Corporation acquires a new office machine (5-Year MACRS asset) on August 2, 2018 for $775,000. This is the only asset placed in service during calendar year 2018 by Knox Corporation. On September 15, 2020 Knox sells the asset for $400,000. a. Calculate Knox Corporation's depreciation expense for 2019 $775,000 - 20% $ 155,000 b. Calculate Knox Corporation's depreciation expense for 2020