When onginally purchased, a vehicle costing $23,000 had an estimated useful life of 8 years and an esemered salvage value of $3,000 After 4 years of magholine deprecation, the smaced useful life was revised from years to 6 years and there was no change in the estimated salvage value. The depreciation expense in year 5 equals $5,750 $5.000 $2.875 O $11.500. O $2.500