France pays large fees to djibouti for the right to export goods from the main port import petroleum from djibouti maintain a military base in the country maintain peace between warring groups

The correct answer is - maintain a military base in the country.

Djibouti is a small but strategically excellent positioned country. France, as one of the world powers, is a country that is heavily involved in the affairs in both North Africa and the Middle East, and Djibouti has the perfect location for building a military base which will be in the middle of them both and will be practical for quick and efficient reactions. So France had built a military base in Djibouti, and for doing so they are obliged to pay an agreed fee to Djibouti every year.

7.03-1.70=5.33 and 6.80+5.09=11.89 and 5.5-3.01=2.49