Buy 0 1 2 3 4 5 Cost of Machine -10,000 After-tax operating saving 3,9603,9603,9603,9603,960 Depreciation Tax benefit 680 680 680 680 680 Total -10,0004,6404,640 4,6404,6404,640 slide 9slide 9 Buy 0 1 2 3 4 5 Cost of Machine -10,000 After-tax operating saving 3,960 3,960 3,960 3,960 3,960 Depreciation Tax benefit 680 680 680 680 680 Total -10,000 4,640 4,640 4,640 4,640 4,640