Answer:
c. $7,500 ordinary gain 
Step-by-step explanation:
Depreciated value of Machine = $55,000 - $12,500 
 = $ 42,500 
Sale price of Machine = $ 50,000 
Gain on sale of Asset = $ 50,000 - $ 42,500 
 = $ 7,500 
Therefore, The amount and character of Butte's gain or loss is $7,500 ordinary gain.