Final answer:
In the special-order decision, ignore the original unit product costs, the fixed portion of the manufacturing overhead, and the allocated fixed administrative costs as they're sunk or unchanged by the special order.
Step-by-step explanation:
In making the special-order decision for Technology Inc. Ltd, certain costs that are not relevant to this decision should be ignored. The first is the original unit product costs of direct materials, labor, and manufacturing overhead, which total to $38, as this special order incurs an additional modification cost, changing the cost structure. The fixed portion of the manufacturing overhead, which amounts to one-third of the total overhead ($6), should also be disregarded; these costs will not change regardless of the special order.
Lastly, the existing fixed administrative costs of $2,100, which are being allocated to the order, should be ignored as they are sunk costs and will be incurred even if the special order is declined.