Final answer:
The overhead cost allocated to job number A1 is €1,000, calculated by multiplying the 10 machine hours used by the €100 per machine hour rate.
Step-by-step explanation:
When allocating overhead costs based on machine hours in a job costing method, the total indirect overhead costs of €100,000 for the manufacturing department should be divided by the budgeted machine hours, which is 1,000 hours. This results in an allocation rate of €100 per machine hour.
For job number A1, which used 10 machine hours, the allocated overhead cost would be 10 hours multiplied by the €100 per machine hour rate. Therefore, the overhead cost allocated to job number A1 is €1,000.