During 2010 and 2011, CBA Inc. drove their truck 15,000 and 22,000 miles, respectively, to deliver supplies to their customers. If they originally purchased the truck at the beginning of 2010 for $175,000 and the truck has an estimated life of 10 years and 320,000 miles with an estimated residual value of $15,000, what amount of depreciation expense should CBA record in 2011 using the activity method?