Grimwood Trucking purchased a tractor trailer for $171,500. Interline uses the units-of-activity method for depreciating its trucks and expects to drive the truck 1,000,000 miles over its 12-year useful life. Salvage value is estimated to be $24,500. If the truck is driven 90,000 miles in its first year, how much depreciation expense should Grimwood record? Select one: a. $12,250 b. $15,435 C. $13,230 d. $14,292