During the current year, Ramirez Developers disposed of plant assets in the following transaction

Feb. 10 Office equipment costing $26,000 was given to a scrap dealer at no charge. At the date of disposal, accumulated depreciation on the office equipment amounted to $25,800. 

Apr. 1 Ramirez sold land and a building to Claypool Associates for $900,000, receiving $100,00 cash and 5 year, 9% note receivable for the remaining balance. Ramirez’s records showed the following amounts: Land, $50,000; Building, $550,000; Accumulated Depreciation: Building (at the date of disposal), $250,000.

Aug.15 Ramirez traded in an old truck for a new one. The old truck had cost $26,000, and its accumulated depreciation amounted to $18,000. The list price of the new truck was $39,000, but Ramirez received a $10,000 trade in allowance for the old truck and paid only $29,000 in cash. Ramirez includes trucks in its Vehicles account.

Oct.1 Ramirez traded in its old computer system as part of the purchase of a new system. The old system had cost $15,000, and its accumulated depreciation amounted to $11,000. The new computer’s list price was $8,000. Ramirez accepted a trade in allowance of $500 for the old computer system, paying $1,500 down in cash and issuing a one year, 8% note payable for the $6,000 balance owed.

Explain how the financial reporting of gains and losses on plant assets differs from the financial reporting of unrealized gains and losses on marketable securities.