calculate the amount of depreciation to report during the year ended december 31 for equipment that was purchased at a cost of $66,000 on october 1. the equipment has an estimated residual value of $1,000 and an estimated useful life of five years or 20,000 hours. required: 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, or (c) units-of-production depreciation. (do not round intermediate calculations.)