Answer and Explanation:
The journal entry is shown below:
Equipment/Computer $3,300
Accumulated depreciation -Truck $18,000
To Truck $20,000
To Gain on disposal of truck $800
To Cash $500
(Being the exchange is recorded)
Here the equipment and accumulated depreciation is debited as it increased the assets while the truck, gain and cash is credited as it decreased the assets but at the same time it increased the revenue