If a fixed asset, such as a computer, were purchased on January 1 for $3,750 with an estimated life of 3 years and a salvage or residual value of $150, the journal entry for monthly expense under straight-line depreciation is 1,200 1,200 $100 $100 Oa. Depreciation Expense Accumulated Depreciation Ob. Depreciation Expense Accumulated Depreciation Oc. Accumulated Depreciation Depreciation Expense Od. Accumulated Depreciation Depreciation Expense 100 100 1,200 1,200