41. (Extra Points) WildCats Company purchased a delivery truck for $30,000. It estimated a 7 -year useful life and $2,000 salvage value. At the end of year 4 (before the depreciation adjustment), it estimated the new total useful life to be 8 years and the new salvage value to be $4,000. Compute the revised annual depreciation using the straight-line method. (a) $2,800 (b) $3,200 (c) $3,600 (d) $4,000