Shamrock, Inc. purchased a tractor trailer for $115000. Shamrock uses the units-of-activity method for depreciating its trucks and expects to drive the truck 1000000 miles over its 8-year useful life. Salvage value is estimated to be $17000. If the truck is driven 80000 miles in its first year, how much depreciation expense should Interline record? O $7270. O $9147. $7840. O $8456.