Marshall Company purchases a machine for $800,000. The machine has an estimated residual value of $40,000. The company expects the machine to produce two million units. The machine is used to make 400,000 units during the current period. If the units-of-production method is used, the depreciation expense for this period is: Multiple Choice O O $152,000 $800,000 O O $760,000. O $160,000