Heathew Co uses the units of production method to estimate depreciation The company purchased a new machine for $52.000 that will produce an estimated 370.000 units over residual value of the machines 55.000 What is the depreciation rate per seule Them e M oe Choice a cost of $92000, with an estimated residual value of $4000 and an estimated useful life of four years. The company uses the double declining balance Apiece of equipment was acquired on January 2018, method. What is its book value at December 31, 2019? 21000