Imus Delivery Service uses accrual accounting, applies the units-of-activity method for depreciating its delivery trucks and closes its books every December 31. On January 1, 2021, Imus Delivery Service purchased a truck for $126,000. The company expects to drive the truck 100,000 miles over its 12-year useful life. Salvage value is estimated to be $18,000. If the truck is driven 8,000 miles in 2021, how much depreciation expense should Imus record in 2021? $8,000. $10,080. $8,640. $9,333.