Final answer:
Mr. Robins' commission rate is 14.99%.
Step-by-step explanation:
To find Mr. Robins' commission rate, we can divide his earnings by the total worth of airfare he booked.
So, the commission rate is:
Commission Rate = (Earnings / Total Worth of Airfare)*100%
Plugging in the given values:
Commission Rate = ($31.29 / $208.69)*100%
= 14.99%
Therefore, Mr. Robins' commission rate is 14.99%.