Answer:
$35,323
Explanation:
Present value = Future value * PVF of single sum(n=3, i=9%)
Present value = $240,000 * 0.77218
Present value = $185,323
Book value = Cost of building - Accumulated depreciation
Book value = $250,000 - $100,000
Book value = $150,000
Gain on sale of building = Present value of note - Book value
Gain on sale of building = $185,323 - $150,000
Gain on sale of building = $35,323