On January 2, 2000 the Gonzalo Corporation purchases an automatic soldering machine for P18,00O. The corporation plans to transfer the machine to subsidiary at the end of 2005 for P11,000. Determine the life of the machine so that the book value at the end of 2005 will be P11,000 if the salvage value after L years should be 4,000 using: a) straight-line method (10 pts.) b) double declining balance method (10 pts.)