using straight line method, find gain or loss.

the right answer is gain in 1750 but i don't know how to get it.

Janae purchased a machine on January 1, 2012, for $15,000. At the time of acquisition, the machine was Company estimated to have a useful life of 10 years and a salvage value of $5,000. They recorded yearly depreciation using the straight-line method. On September 30, 2015, the machine was sold for $13,000. hat should be the gain loss recognized from the sale of the machine