Answer: $230,000
Step-by-step explanation:
In our case, 
Undiscounted future cash inflows from the sale of the product = $ 600,000 and 
Carrying value of the asset = $ 720,000. 
We can come to a conclusion that the benefit we get from the sale of the asset is less that carrying value. 
Hence, the asset is said to be impaired. 
Therefore, 
Impairment Loss = Carrying value - Fair value of the asset
 = 720,000 - 490,000 
 = $230,000.