On July 1, 2015, Jackson Company purchased equipment for $400,000, and installation and testing costs totaled $40,000. The equipment has an estimated useful life of 10 years and an estimated salvage value of $40,000. If Jackson uses the double-declining-balance method, the depreciation expense for 2015 would be: Select one: a. $72,000. b. $44,000. c. $36,000. d. $40,000. e. $88,000.