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Hep Save & EXIt Submit Marshall Company purchases a machine for $200,000. The machine has an estimated residual value of $40,000. The company expects the machine to produce four million units. The machine is used to make 420,000 units during the current period If the units-of-production method is used, the depreciation expense for this period is: $420,000 To o o o $380,000 $16,800. ) $21,000