Blue Spruce Company purchased a delivery truck for $34,000 on January 1,2022 . The truck has an expected salvage value of $1,140, and is expected to be driven 106,000 miles over its estimated useful life of 10 years. Actual miles driven were 16,300 in 2022 and 11,400 in 2023. (a1) Calculate depreciation expense per mile under units-of-activity method. (Round answer to 2 decimal places, e.g. 0.50.) Depreciation expense $ per mile