Based on the information given the depreciation expense for year 2 is $4,500.
First step is to calculate depreciation rate per unit
Depreciation rate per unit = ($160,000 - $10,000)/100,000 hours
Depreciation rate per unit=$150,000/100,000 hours
Depreciation rate per unit = $1.50 per machine hour
Second step is to calculate Year 2 depreciation
Year 2 depreciation=3,000 hours x $1.50
Year 2 depreciation= $4,500
Inconclusion the depreciation expense for year 2 is $4,500.
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