In recent years,SarasotaTransportation purchased three used buses. Because of frequent turnover in the accounting department, a different accountant selected the depreciation method for each bus, and various methods were selected. Information concerning the buses is summarized as follows.

Bus Acquired Cost Salvage Value Useful Life in Years DepreciationMethod

1 1/1/18 $99,300 $7,500 4 Straight-line

2 1/1/18 126,000 11,500 4 Declining-balance

3 1/1/19 91,100 8,500 4 Units-of-activity

For Bus #3, calculate depreciation expense per mile under units-of-activity method.(Round answer to 2 decimal places, e.g. 0.50.)

Depreciation expense= $ per unit