Straight-line depreciation is the simplest depreciation method because it assumes assets lose value evenly throughout their lives. The annual depreciation rate is 100% divided by the useful life; for example, a five-year useful life asset has an annual depreciation rate of 100%/5 = 20%. The annual depreciation expense is the depreciation rate times the depreciable cost.
A five-year asset purchased for $100,000 with an expected residual value of $10,000 has an annual depreciation expense of 0.2 x ($100,000- $10,000)_________ ' After each year, the depreciation expense reduces the depreciable basis (for example, after the first year, the depreciable basis is______