Answer:
The annual depreciation under SL is $16000 per year.
Step-by-step explanation:
The depreciation expense under Straight Line (SL) method remains constant throughout an asset's useful life. The depreciation under straight line method is calculated by calculating the value of the asset that is eligible for depreciation, which is its cost less the salvage value (SV) and dividing it by the asset's useful life.
The straight line depreciation per year = (Cost - SV) / estimated useful life
Annual depreciation under SL = (100000 - 20000) / 5 = $16000 per year