Chapter 9 Homework Straight-Line Depreciation A building acquired at the beginning of the year at a cost of $140,400 has an estimated residual value of $5,400 and an estimated useful life of 10 years. Determine the following: (a) The depreciable cost (b) The straight-line rate (c) The annual straight-line depreciation X% Feedback Check w won Depreciable cost is the difference between the asset's initial cost and its residual value. The residual value is the estimated value at the end of the useful life. Straight-line depreciation allocates the depreciable cost of the asset equally over the expected useful life