Calculate the amount of depreciation to report during the year ended December 31 for equipment that was purchased for 72,000 on October 1. The equipment has been estimated residual value of 9,000 and estimated useful life of 5 years or 20,000 hours . Assume the equipment was used for 1,000 hours from October 1 to December 31 and the company uses a.) straight line b.) double declining balance and c.) units by production. Depreciation