Tasty Subs acquired a delivery truck on September 1, 2018, for $19,500. The company estimates a residual value of $1,300 and a five-year service life. It expects to drive the truck 140,000 miles. Actual mileage was 4,600 miles in 2018 and 18,200 miles in 2019. Required: Calculate depreciation expense using the activity-based method for 2018 and 2019, assuming a December 31 year-end. (Do not round your intermediate calculations.) 2018 2019 Depreciation expense