Explanation:

- The term "formal sector" refers to officially recognized employment with legal protection and regulation, contrasting with informal or unregistered employment.

- Government reports and studies from various economies estimate that the percentage of the workforce involved in the formal sector can vary based on the country’s development.

- Option 1: 22% - It's possible in more industrialized nations where there is stronger regulation.

- Option 2: 6% - In some developing countries, this percentage might be this low, highlighting fewer formal job opportunities.

- Option 3: 24% - Similar to option 1, but often in regions with robust job markets.

- Option 4: 10% - This can be applicable to countries transitioning from informal to formal economies more rapidly.

Option 2: 6% is Correct.