Experts please answer me this question. Thank You.

Amy Inc. purchased a piece of equipment for $30,000 on January 1, 2013. It estimates a residual value of $3,000 and a useful life of 5 years. It uses the straight-line method of depreciation. On December 31, 2015 its fair value is determined to be $15,000 and the estimated costs to sell are estimated to be $2,000. What is the new depreciation expense starting in 2016 (rounded to the nearest dollar)? a. $3200 b. $4200 C. $2600 d. $4333