When originally purchased a vehicle had an estimated useful life of 12 years. The vehicle cost $39000 and its estimated residual value is $3.000. After 3 years of straight-line depreciation the assets total estimated useful life was revised from 12 years to 8 years and there was no change in the estimated residual value. The depreciation expense in year 4 is (Round your final answer to the nearest whole number) $4.225 $5.400 $950 $4.500