11) A company has recently purchased an overhead travelling crane for $2,500,000. Its expected life is seven years and the salvage value at the end of the life of the overhead travelling crane is $100,000. Using the straight line method of depreciation, find the depreciation and the book value at the end of third and fourth year after the crane is purchased. 12) Consider Problem 11 and find the following using the sum-of-the-years- digits method of depreciation: (a) Depreciation at the end of the fourth year (b) Depreciation at the end of the seventh year (c) Book value at the end of the fifth year (d) Book value at the end of the eighth year