3 Page Problem 6: First cost of a machine is 15,000 with life of 5 years or 2000 working hours and estimated salvage of 5,000 SR. If the company used this machine as shown in the following table: year Working hours 1 200 2 2 50 3 1 50 4 500 5 400 Calculate the Book Value at the end of the third year using: a) Straight Line Model b) Activity Model c) Sum-of-the-Years'-Digits Method