On July 1, Hartman Construction purchases a bulldozer for $205,200. The equipment has a operating hours. What is the depreciation expense per hour of operation? a. $8.29 b. $1.40 c. $7.74 d. $7.20 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