The machine's second year depreciation expense is $3,200.
The units-of-production method is a depreciation method where the depreciation expense in a given year is determined by the units of output produced in a given year.
Units-of-production method = (output produced that year / total output of the machine) x (Cost of asset - Salvage value)
Total output of the machine = 1500 + 1000 + 1250 = 3750
Year 2 depreciation expense = (1000 / 3750) x ($15,000 - $3000) = $3,200
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