Final answer:
The manufacturing cost of the pencil case in euros per unit using the split-off point sales value method is €0.0861.
Step-by-step explanation:
The manufacturing cost of the pencil case in euros per unit using the split-off point sales value method can be calculated by dividing the total cost of processing the trees into pencil cases by the number of pencil cases produced. In this case, the total cost of processing 350 trees into 180,000 pencil cases is €15,500. Therefore, the manufacturing cost of the pencil case in euros per unit is €15,500 / 180,000 units = €0.0861 per unit.