A gas-powered electric generator is purchased by a public utility as part of an expansion program. It is expected to be useful, with proper maintenance, for an estimated 30 years. The cost is $17 million, installed. The salvage value at the end of 30 years is expected to be 10% of the original cost, not counting installation. a. What is the MACRS-GDS property class? b. Determine the depreciation deduction and the unrecovered investment for years 1,5, and the last depreciable year of the generator