Kingbird, Inc. purchased a tractor trailer for $168000. Kingbird uses the units-of-activity method for depreciating its trucks and expects to drive the truck 1000000 miles over its 10-year useful life. Salvage value is estimated to be $22000, If the truck is driven 56000 miles in its first year, how much depreciation expense should Kingbird record? O $8176 o $9408 O $14988 O $7429