7. A machine has an initial cost of $50,000 and a salvage value of $10,000 after 10 years of useful life. What is the book value of this machine after five years if the company has been using the MACRS depreciation, half-year method? a. $18,500 b. $24,700 c. $30,000 d. $31,600 7. A machine has an initial cost of $50,000 and a salvage value of $10,000 after 10 years of useful life. What is the book value of this machine after five years if the company has been using the MACRS depreciation, half-year method? a. $18,500 b. $24,700 c. $30,000 d. $31,600