Douggan Company ppurchased equipment on january 1, 2020 for 90,000. It estimated the equipmet will have a $5000 salvage at the end of its 5-year useful life. It is also estimated that the equipment will produce 10,000 units over its 5-year life. compute the amount of depreciation expense for the year ended december 31, 2020, using the straight line method of depreciation. If the company use 16,000 units of prod. in 2020 and 24,000 unitus in 2021. Whats the book value? (depreciat. method)