Answer:
Amount is $400,000. It is a gain on disposal.
Step-by-step explanation:
Cost = $600,000
Accumulated depreciation = $200,000
Net book value = $600,000 - $200,000
= $400,000
Sales proceed = $800,000
Gain/loss on disposal = Sales proceed - Net book value
= $800,000 - $400,000
= $400,000
Amount is $400,000. It is a gain on disposal.