Answer:
A gain equal to the difference between the fair value and carrying amount of the truck given up.
Step-by-step explanation:
With commercial substance, the exchange is measured at fair value. The full gain is recognized and is equal to the difference between the fair value of the asset given up and its book value.
For example, assume the following values: new asset fair value 20, old asset fair value 26, cash received 6, old asset cost 30, old asset accumulated depreciation 9. The full entry is: dr. New Truck 20; dr. Accumulated Depreciation 9; dr. Cash 6; cr. Old Truck 30; cr. Gain 5.
The gain equals the old asset's fair value of 26 and its book value of 21 (30 - 9).