Straight line depreciation expense = (Cost of asset - Salvage value) / useful life
Annual depreciation = ($765,000 - $153,000) / 36 = $17,000
Book value in the 20th year = cost of the asset - accumulated depreciation
765,000 - (17,000 x 20) = $425,000
Depreciation expense for each of the 20 years = (book value - new residual value) / new useful life
(425,000 - $25,000) / 20 = $20,000
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