$30,000 decrease
Explanation:
The computation is shown below:
In the case when the production is done from Chetak's Factory
Number of Components produced 1500015000
Total cost incurred $600,000
In the case when the production is done from outside
Number of Components produced 15,000
Total cost spend $630,000((15,000 × 34) + $120,000)
S the difference is
= $600,000 - $630,000
= -$30,000
Therefore the second option is correct