In 2013, about Group of answer choices 40 percent of foreign exchange transactions involved exchanges of foreign currencies for U. S. dollars. 20 percent of foreign exchange transactions involved exchanges of foreign currencies for U. S. dollars. 30 percent of foreign exchange transactions involved exchanges of foreign currencies for U. S. dollars. 87 percent of foreign exchange transactions involved exchanges of foreign currencies for U. S. dollars. 10 percent of foreign exchange transactions involved exchanges of foreign currencies for U. S. dollars.