A $5 million oil drilling rig has a 5-year depreciable time. (a) Determine which one of the following meth- 100% bonus depreciation or MACRS. (b) Show the depreciation schedule for the preferred method. (C) Search for new oil rig technologies and describe three that improve environmental impact. 11.17 A $5 million oil drilling rig has a 5-year depreciable time. (a) Determine which one of the following meth- 100% bonus depreciation or MACRS. (b) Show the depreciation schedule for the preferred method. (C) Search for new oil rig technologies and describe three that improve environmental impact. 11.17