Answer:
$28000
25%
$7000
Step-by-step explanation:
Depreciable cost = cost of the asset - residual value
$30,800 - $2800 = $28,000
The straight-line rate = annual depreciation expense / Depreciable cost
7000 / 28,000 x 100 = 25%
Straight line depreciation expense = (Cost of asset - Salvage value) / useful life
$28,000 / 4 = $7000