Question 4.4(10pts) An industrial air conditioner with an expected useful operating life of 30,000 hours costs $45,000. It is known that the salvage value of the air conditioner is $10,000 at the end of its useful life. The total working time of the air conditioner during first year is 4,000 hours. Find the depreciation for the first year by using the unit-of-production method. A) $5,333.33 B) $4,666.67 C) $6,000.00 D) Answers A, B and C are not correct