Answer:
Minimum transfer price = $10
Step-by-step explanation:
The Division A is operating at full capacity, hence it has no excess capacity
This implies that it can not produce enough to meet both the internal demand (from Division B) and external buyers.
Hence, it implies that Division A can not accommodate the demands of the Division B at a price lower than the external price of $10. Any price lower than $10 would result into a loss in contribution.
To maximize and optimize the group profit
Minimum transfer price = External selling price at which Division A can sell product XX
Minimum transfer price = $10