4. (a) You purchase a tugboat for 900,000. After 20 years its Salvage Value will be 150000 Calculate the yearly depreciation and book value of this mandated MACRS tables. In the interests of time show only the first 7 years. investment using the government (a ) only this time use a declining balance rate such that the book value- the salvage value at the end of the 20 year period. (Show first 7 years only) ea