Brenan, Inc. purchased equipment at the beginning of 2004 for $1,520,000. Brenan. The equipment has an estimated residual value (salvage value) of $20,000 and an estimated life of 5 years or 100,000 hours of operation. The machinery was operated for 15,000 hours in 2004, 20,000 hours in 2005, 35,000 hours in 2006, 20,000 hours in 2007, and 10,000 hours in 2008..how would we create a depreciation schedule for Units-of-production method