A delivery truck costing $24,000 is expected to have a $2,000 salvage value at the end of its useful life of four years or 125,000 miles. Assume that the truck was purchased on January 1. Calculate the depreciation expense for the first year using the following depreciation methods: units-of-production. (Assume that the truck was driven 28,000 miles in the first year.) a) 6,000 b) 4,928 c) 5,500 d) 12,000