Transocean Drilling spent $236,000,000 to purchase a new offshore drilling rig capable of drilling to 40,000 feet. The useful life is 20 years and the salvage value is estimated to be $12,000,000. Use the straight-line method of depreciation to find
(a) the annual rate of depreciation
(b) the annual amount of depreciation, and
(c) the book value at the end of 5 years