Plummer Industries purchased a machine for $ 43,800 and is depreciating it with the straight- line method over a life of 8 years, using a residual value of $ 3,000. At the beginning of the sixth year, an extraordinary repair was made costing $ 7,500, the estimated useful life was extended to 13 years, and no change was made to the estimated residual value. Calculate depreciation expense for year 6, rounded to the nearest dollar.