Could I please get some assistance?

2. On January 1, 2018, Swift Corp. purchased a truck for $88,000. The manager estimated that the truck would be driven 300,000 miles during the next 6 years, at which time it would have a salvage value of $7,000. At the end of the first two years, the odometer read 88,000. If the company uses the activity method of depreciation, what is the book value of the truck on December 31, 2019