Answer:
The amount of Mr. D's gain on the sale 22,000 dollars.
Explanation:
The gain on sale is calculated by subtacting, the sum of book value/cost of asset and cost of diposal from consideratiion received. In case consideration received is in kind than fair value of benifit traded is taken as consideration.
Cash Received   = 37,000
Art work FV Â Â Â Â Â = 12,500
Selling expenses  = (2,500)
Cost of land      = (25,000)
Profit/Gain       = 22,000