can someone please help me find annual depreciation in 3 to 6 years.

The Donut Stop acquired equipment for $27,000. The company uses straightline depreciation and estimates a residual value of $5,000 and a four-year service life. At the end of the second year, the company estimates that the equipment will be useful for four additional years, for a total service life of six years rather than the original four. At the same time, the company also changed the estimated residual value to $2,800 from the original estimate of $5,000. Required: Calculate how much The Donut Stop should record each year for depreciation in years 3 to 6