(chapter supplement) irish industries purchased a machine for $65,000 and is depreciating it with the straight-line method over a life of 10 years, using a residual value of $3,000. at the beginning of the sixth year, a major overhaul was made costing $5,000, and the total estimated useful life was extended to 13 years with a residual value of $3,000. depreciation expense for year 6 is: $1,885 $2,000 $3,250 $3,625 $4,500