Answer:
Option B is correct
$30,000 increase
Step-by-step explanation:
$
The cost of internal production ($26 × 15,000)= 390,000
The cost of purchase = ($24 × 15,000) = (360,000 )
Differential cost (increase) 30,000
Note that the fixed cost was not included in the cost of manufacturing . This is so because they they are not relevant for this decision. They would be incurred either way whether or not the parts are made or purchased
There would be an increase of $30,000 if the parts are made rather purchasing them