5. an industrial plant bought a generator set for 90,000. the generator is to have a life of 17 years with a salvage value at the end of life of 5,000. determine the depreciation charge during the 13 year and the book value at the end of 13 years by the (a) declining balance method, (b) double declining balance method, (c) sinking fund method at 12% and (d) so