On July 1, Hartman Construction purchases a bulldozer for $205,200. The equipment has a 9-year life with a residual value of $14,400. Hart ford uses the units-of-activity method of depreciation, and the bulldozer is expected to yield 26,500 operating hours. What is the depreciation expense per hour of operation? a. $7.20 b. $8.29 c. $1.40 d. $7.74