Calculate the amount of depreciation to report during the year ended December 31, 2017, for equipment that was purchased at a cost of $33,000 on September 1, 2017. The equipment has an estimated residual value of $3,000 and an estimated useful life of five years or 20,000 hours. Assume the equipment was used for 1,000 hours from September 1 to December 31. Calculate the amount of depreciation if the company uses 

(a) Straight-line, 

(b) Double-declining balance, 

(c) Units-of-production depreciation.