Answer:
 the net advantage of upgrading is $20,000
Step-by-step explanation:
The computation of the net advantage or disadvantage is as follows:
Sales value after upgrading $230,000
Less: current sales value -$40,000 
Incremental advantage of upgrading $190,000
Less:total cost of upgrading ($170,000) 
Net advantage of upgrading $20,000
Hence, the net advantage of upgrading is $20,000