Wildhorse Co. purchased a delivery truck for $42,000 on January 1. 2022. The truck has an expected salvage value of $8,000, and is expected to be driven 100,000 miles over its estimated useful life of 8 years. Actual miles driven were 16,000 in 2022 and 11,300 in 2023. (a1) Calculate depreciable cost per mile under units-of-activity method, (Round answer to 2 decimal places, eg. 0.50.) Depreciable cost $ per mile