Withering corp (december 31st fiscal year end) purchased a piece of machinery, which it will use to produce inventory, on august 1st, 2018 for $450,000. the estimated salvage value is $50,000. the estimated useful life is 4-years. the estimated total activity levels for this machinery over its useful life are production of 1,000,000 units of inventory and working hours of 50,000 hours. actual activity for 2018-2019 is as follows: 2018: 100,000 units of inventory produced; 8,500 working hours 2019: 275,000 units of inventory produced; 14,000 working hours if necessary, round your answer to the nearest dollar. do not use dollar signs or decimals. what is the book value (cost - accumulated depreciation) associated with this machinery as of december 31st, 2019 assuming withering uses sum-of-the-years'-digits depreciation method?