Jayhawk Bus Lines uses the units-of-activity method in depreciating its buses. One bus was purchased on January 1, 2014, at a cost of $123, 000. Over its 4-year useful life, the bus is expected to be driven 196, 800 miles. Salvage value is expected to be $9,840. Compute the depreciation cost per unit. (Round answer to decimal places e.g. 6.251)