WeDeliver Incorporated is the world's leading express-distribution company. In addition to its 643 aircraft, the company has more than 57,000 ground vehicles that pick up and deliver packages. Assume that We Deliver sold a delivery truck for $19,000. WeDeliver had originally purchased the vehicle and recorded it in the Truck account for $31,000 and had recorded depreciation for three years. Required: 1. Calculate the amount of gain or loss on disposal, assuming that Accumulated Depreciation-Truck was (a) $12,000, (b) $7,000, and (c) $15,000. (Select "None" if there is no Gain or Loss.)