For income statement purposes, when is depreciation expense considered to be a variable expense? A. when...

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For income statement purposes, when is depreciation expense considered to be a variable expense? A. when units-of-output method is used B. when straight-line method is used C. when double - declining - balance method is used D. Never. For income statement purposes, when is depreciation expense considered to be a variable expense? A. when units-of-output method is used B. when straight-line method is used C. when double - declining - balance method is used D. Never.