CK purchased a piece of equipment at the end of December 2019,cost $20000,salvage value $200,estimated useful life

New in the month, depreciation next month, so depreciation begins in January 2020, the first year of depreciation = (original value - net salvage value) * 5/15 = (200000 - 5000) * 5/15 = 65000. so 2020 year-end depreciated value = 200000 - 65000 = 135000 > recoverable amount of 120,000, should be provision for impairment 15000, so the book value = original value - accumulated depreciation - provision for impairment = 200000 - 65000 - 15000 = 120,000