Final answer:
Based on the information provided, Arnold is most likely a self-employed individual as he maintains his own office, has one major client, and is responsible for his own business operations.
Step-by-step explanation:
Based on the information provided, Arnold is most likely a self-employed individual.
Here are some reasons why:
- He maintains his own office and pays the rent for it.
- He has one single client who accounts for 95% of his billings.
- The client pays him a monthly retainer and occasional additional amounts for extra work.
These factors suggest that Arnold has control over his work and is responsible for his own business operations. As a self-employed individual, Arnold would be responsible for filing his own taxes, including corporate income tax on his profits, individual income tax on his salary, and payroll taxes taken out of the wages he pays himself.