The amount of depreciation expense for the 3 years ended straight line method,unit method, double line for 3yrs?

Dexter Industries purchased packaging equipment on January 8 for $86,900. The equipment was expected to have a useful life of three years, or 20,000 operating hours, and a residual value of $6,900. The equipment was used for 8,640 hours during Year 1, 6,710 hours in Year 2, and 4,650 hours in Year 3.
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