Question: For the tractor of Problem, find the annual depreciation and book value at the end of each year using the sum-of-the-years; -digits method of depreciation.
Problem: A crawler tractor costs $250,000, has an estimated salvage value of $50,000, and has a 5-year life. Find the annual depreciation and book value at the end of each year using the double-declining-balance method of depreciation.