with calculations please

In Jan 2017 Ross Inc. purchased a manufacturing plant costing $130,000. Ross estimated the plant's life and residual value at 8 years and $10,000, respectively. In Jan 2020 Ross revised the plant's life down from a total of 8 to a total of 6 years, and the residual value down to $5,000. Determine annual depreciation expense for 2020, assuming Ross uses the straight-line method of depreciation