17. MACRS and Averaging Conventions. (Obj. 1) Jan purchased the following properties during 2021. Description Date Placed in Service Cost New Computer March 9, 2021 $ 6,000 Used Machinery July 17, 2021 70,000 Used Office building September 6, 2021 270,000 New Equipment December 27, 2021 84,000 Compute Jan's depreciation for each of these properties for 2021 and 2022. Assume that Jan elected to expense 50% of the cost of each item of qualified property and elected out of bonus depreciation. The machine and equipment are 7-year property