Exercise 9-20 Ivanhoe Company purchased a new machine on October 1, 2017, at a cost of $87,800. The company estimated that the machine has a salvage value of $8,000. The machine is expected to be used for 64,200 working hours during its 8-year life. Compute depreciation using the following methods in the year indicated. Declining balance using double the straight line rate for 2017 and 2015. (Round answers to decimal places.. 125) 2017 Depreciation using the Declining-balance method Calculate the depreciation cost per hour (Round answer to decimal places 1.2) Depreciation cost per hour Units of activity for 2017, ssuming machine usage vas 410 hours (Round answer to decimal places 125) Depreciation using the Units of activity method for 2017