Answer: $8000
Explanation: Under straight line method of depreciation, the book value of an asset is spread over its useful life . It can be computed using following formula :-
![=\:(Initial cost\:-\:salvage\:value)/(useful\:life)](https://img.qammunity.org/2020/formulas/business/college/cmvpd7i1dxrtdcgc0dfosn8nh9ozb5p0vc.png)
putting the values into equation we get,
![=\:(50,000\:-\:10,000)/(5)](https://img.qammunity.org/2020/formulas/business/college/6pd5f6qsycs8x6unsyk4w54o9k6ugb78s8.png)
therefore,
depreciation expense = $8000