Rosco Taxi Service uses the units-of-activity method in computing depreciation on its taxicabs. Each cab is expected to be driven 150,000 miles. Taxi no. 10 cost $39,500 and is expected to have a salvage value of $500. Taxi no. 10 was driven 30,000 miles in 2022 and 20,000 miles in 2023. (a1) Calculate depreciation cost per mile using unit-of-activity method. (Round answer to 2 decimal places, eg. 0.50) Depreciation cost $ per mile