M9-15 (Supplement 9B) Computing Revised Depreciation after Change in Cost and Estimated Life [LO 9 S2) Plummer Industries purchased a machine for $48,100 and is depreciating it with the straight-line method over a life of 8 years, usinga residual value of $1,700. At the beginning of the sixth year, an extraordinary repair was made costing $3,200, 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. (Do not round intermediate calculations.) epreciation Expense