Final answer:
The depreciation expense for the second year using the double-declining-balance method is $6,400, calculated by applying a rate of 20% to the book value of the computer system at the beginning of the second year, which is $32,000.
Step-by-step explanation:
The depreciation expense for the second year using the double-declining-balance method can be calculated by following these steps:
Subtract the residual value from the cost to find the depreciable base: $40,000 (cost) - $5,000 (residual value) = $35,000.
Calculate the depreciation rate: 2 x (1/10) = 0.2 or 20% (since it is the double-declining-balance method).
Apply the depreciation rate to the book value at the beginning of the second year. The book value at the beginning of the second year is the cost minus the first year's depreciation. In the first year, the depreciation would be 20% of $40,000, which is $8,000. This makes the book value at the beginning of the second year $32,000 ($40,000 - $8,000).
Calculate the second year's depreciation: 20% of $32,000 = $6,400.