11-9 A $5 million oil drilling rig has a 5-year depreciable G life and a $250,000 salvage value at the end of that time. (a) Determine which one of the following meth- ods provides the preferred depreciation schedule: DDB or SOYD method. three that improve environmental impact. (b) Show the depreciation schedule for the preferred (c) Search for new oil rig technologies and describe