Pemberton Corporation purchased a machine costing $300,000 that had an estimated useful life of six years and residual value of $18,000. The machine is expected to produce 3,525,000 units during its useful life, as follows:

Required
a. What will be each year's depreciation charge if Pemberton uses the units-of-production method?
b. Will this give significantly different depreciation charges in each year than the sum-of the-years' digits method?

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Year Units 930,000 800,000 580,000 500,000 415,000 300,000 3,525,000 4