Southern atlantic distributors began operations in january 2018 and purchased a delivery truck for $20,000. southern atlantic plans to use straight-line depreciation over a four-year expected useful life for financial reporting purposes. for tax purposes, the deduction is 45% of cost in 2018, 30% in 2019, and 25% in 2020. pretax accounting income for 2018 was $220,000, which includes interest revenue of $36,000 from municipal bonds. the enacted tax rate is 25%.