9-9A (Part Level Submission) Pronghorn Corporation purchased machinery on January 1, 2017, at a cost of $310,000. The estimated useful life of the machinery is 4 years, with an estimated salvage value at the end of that period of $24,000. The company is considering different depreciation methods that could be used for financial reporting purposes (a) Prepare separate depreciation using the straight-line method, and the declining-balance method using double the straight-line rate for the STRAIGHT-LINE DEPRECIATION utation Book Value 2017 2018 2019 2020