Answer:1, 11, and IV
Explanation:
The price of X-547 is relevant so it can be compared with the price of selling Xylene IV.
The variable cost of processing X-547 to X-ylene is also relevant to determine the contribution from the product.
The selling price of Xylene will also help in determining the contribution.
Since the fixed cost of processing X 547 to X-ylene is avoidable means it's not relevant.
The joint cost of process from which X 547 is produced is also not relevant since it will be Incurred if X 547 is produced or not.