3. A machine costing $185,000 with a 5 -year life and $20,000 residual value was purchased January 2. Compute depreciation for each of the five years, using the double-declining-balance method. 4. Computer equipment was acquired at the beginning of the year at a cost of $63,000 that has an estimated residual value of $3,000 and an estimated useful life of 5 years. Determine the (a) depreciable cost (b) double-declining-balance rate, and (c) double-declining-balance depreciation for the first year