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How to calculate
Depreciable Base
=asset cost- asset salvage value
Straight Line Method
Depreciation Expense = depreciable base/economic life
Accumulated Deperciation = all previous depreciation
Net Book Value = Asset Cost - Accumulated Depreciation
Sum Years Digits Method
Years Digits = (economic life *(economic life +1)) /2
Depreciation Expense = depreciable base * (years remaining+1 / years digits)
Accumulated Deperciation = all previous depreciation
Net Book Value = Asset Cost - Accumulated Depreciation
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