Answer: $0.29 per mile
Step-by-step explanation:
Truck is to be driven for 100,000 miles.
It has a cost of $34,000 and a salvage value of $5,000.
Useful life is 8 years.
Depreciable cost per mile under units-of-activity method = (Cost price - Salvage value) / Miles to be driven
= (34,000 - 5,000) / 100,000
= $0.29 per mile